Vehicle and Traffic (Vehicle Operations) (Conjoined Trailer Units) Notice 2025

The notice builds around a small set of defined concepts that determine eligibility and operational constraints.

• Traffic light trailer. Defined in clause 3(1) as a single axle trailer that is affixed with one set of traffic lights; designed and built to be connected to another traffic light trailer to form a conjoined trailer unit; and registered under the Vehicle and Traffic Act 1999. The registration requirement is an express precondition for a trailer to qualify as a traffic light trailer (clause 3(1)).

• Conjoined trailer unit. Defined in clause 4. It means a trailer comprised of two traffic light trailers and meeting two further requirements. First, the two trailers must be arranged in a lead and rear configuration (clause 4(2)(a)). Second, they must be securely connected by a rigid coupling mechanism such that there is no possibility of articulation or rotation along the axis of that coupling, and when under tow both trailers move as if one single trailer (clause 4(2)(b)). Both trailers must be manufactured by the same manufacturer (clause 4(2)(c)). The combination of these features characterises the permitted object as a rigid, two‑unit assembly rather than an articulated dolly or multiple tow chain.

• Exemption from regulation 32. Clause 6(2) provides the operative exemption: regulation 32 of the Vehicle Operations Regulations does not apply to a person using, or causing or permitting the use of, a light vehicle to tow a conjoined trailer unit, but only subject to the conditions in clause 6(3). The notice does not repeal or amend regulation 32; it creates a conditional, temporary exception.

• Safety systems and technical standards. Clause 6 defines "loaded mass" and "safety chain" for the purposes of the notice and imports AS 4177.4‑2004 for safety chain compliance (clause 6(1)). Clause 6(3)(j) requires axle and tyre load carrying capacity to have a sufficient manufacturer rating and to be compliant with ADR 43/04, except for the ADR requirement that axles be related via a load sharing suspension. Clause 6(3)(i) requires an efficient braking system fitted to at least one wheel of each end of at least one axle, other than a jockey wheel.

• Operational prohibitions and constraints. Clause 6(3)(e)-(g) prohibit carriage of items other than traffic light equipment, prohibit each set of traffic lights being under operation while under tow, and limit permitted power sources for the lights to either solar and battery power or petrol or diesel motor power.

• Temporal and geographic scope. Clause 5 provides that the exemption applies to the whole State at all times of day and for a three year term commencing on the notice commencement date. Clause 3(2) preserves use of defined terms from the Vehicle and Traffic Act 1999 and the Vehicle Operations Regulations where those terms are used in the notice.

These concepts together make the exemption narrowly targeted: it covers only pairs of registered single‑axle traffic light trailers manufactured by the same manufacturer and coupled in a rigid, non‑articulating way that mimics a single trailer, towed by a light vehicle and subject to a list of technical and operational constraints. The drafting couples the legal exemption to specified technical standards and operational rules rather than to broad or open ended criteria.

The notice affects a discrete set of actors identified by the text. Those primary parties are:

• Operators and owners of traffic light trailers. A trailer must be a "traffic light trailer" as defined in clause 3(1) to form part of a conjoined trailer unit. That requires the trailer to be single axle, affixed with one set of traffic lights, designed to be connectable to another traffic light trailer for use as a conjoined unit, and registered under the Vehicle and Traffic Act 1999 (clause 3(1)). Therefore owners or operators of such trailers who wish to tow them in conjoined configuration will be directly affected because they must ensure the trailers meet the construction, registration and equipment requirements in clauses 3 and 4 and the conditions in clause 6(3).

• Light vehicle owners and drivers. The exemption specifically applies to a light vehicle towing the conjoined trailer unit (clause 6(3)(a) and clause 6(2)). The towing vehicle must also be capable of satisfying the design and force‑withstanding conditions in clause 6(3)(k) and must not exceed any manufacturer maximum speed or other limit when towing, if such a limit applies (clause 6(3)(m)). Drivers who tow a conjoined trailer unit will need to comply with the operational prohibitions, such as ensuring the traffic lights are not under operation while under tow and that permitted power sources are used for the lights when they are in service or being transported (clause 6(3)(f)-(g)).

• Manufacturers and suppliers of traffic light trailers and coupling equipment. Clause 4(2)(c) requires both traffic light trailers to be manufactured by the same manufacturer. Clause 6(3)(b)-(d) and 6(3)(j)-(k) impose construction, safety chain and load capacity requirements and demand that connections and components be designed to withstand applied forces. Manufacturers who wish their units to be used under this exemption will need to ensure conformity with those requirements and with AS 4177.4‑2004 and ADR 43/04 to the extent specified (clause 6(1) and 6(3)(j)). Suppliers of rigid coupling mechanisms must supply couplings that forbid articulation or rotation along the coupling axis while permitting "normal angular movement" without excessive slack on the safety chain (clause 4(2)(b) and clause 6(3)(c)(ii)).

• Registrars and vehicle compliance/inspection bodies. Because a traffic light trailer must be registered under the Vehicle and Traffic Act 1999 (clause 3(1)), registrars will be a point of interface for compliance. The Department of State Growth administers the notice, which suggests it will be the administrative contact for queries and compliance oversight (administration note at the end of the notice). Inspectors or compliance officers will need to assess compliance with the technical conditions set out primarily in clause 6.

• Organisations that hire or operate traffic control equipment on roads. Companies or entities that supply mobile traffic light units for road works, events or construction sites will be affected in how they can transport units between sites. The notice restricts what can be carried in the trailers while towed and constrains operation of the lights while under tow (clause 6(3)(e)-(g)), which may affect their logistics and scheduling.

• Indirectly affected parties. While not directly named, other road users and insurers are indirectly affected by the statutory permission for light vehicles to tow the conjoined arrangement under prescribed conditions. The notice does not set out insurance obligations or liability regimes, so existing insurance contracts and civil liability rules under the Vehicle and Traffic Act 1999 and general law will continue to apply outside the scope of this notice.

Who pays. The notice does not set fees or taxes, but compliance costs fall mainly on the trailer owner/operator and on manufacturers where design changes, certification, or modifications are required. Costs include ensuring registration, fitting compliant safety chains (AS 4177.4‑2004), meeting axle and tyre ratings and ADR 43/04 compliance as modified by the notice, installing or maintaining braking on specified wheels, and documentation to demonstrate conformity.

Who decides. The Transport Commission adopted the notice and the Department of State Growth administers it. Operational decisions about whether a particular trailer combination qualifies under the notice are functionally made by owners and operators (in meeting the technical criteria) and by the relevant regulator or inspector when assessing compliance against the textual conditions set out in clause 6.

Duration and renewability. The exemption is temporary, operating for three years from commencement (clause 5(c)). Parties intending to rely on the exemption must plan for the end of its operation and the potential need to revert to the requirements of regulation 32 or to seek an alternative authorisation after the exemption lapses.

The notice imposes operational and technical duties on persons who use, cause, or permit the use of a light vehicle towing a conjoined trailer unit. It also creates a narrow legal right to be outside the operation of regulation 32 while those duties are complied with. The provisions to note are:

Duties to be met to obtain and retain the exemption

• Use of a light vehicle. Clause 6(3)(a) requires that the conjoined trailer unit must, when under tow, be towed by a light vehicle. If the trailer is not towed by a light vehicle, it does not meet the condition set out in clause 6(3)(a).

• Safety chains and their attachment. Clause 6(3)(b)-(d) requires two safety chains meeting the AS 4177.4‑2004 definition (clause 6(1)), one fitted to the lead traffic light trailer and attached to the towing vehicle, and another attached securely to the rear trailer and to the lead trailer while being towed. The lead trailer safety chain must be built and fitted so that it keeps the trailer in tow should the coupling to the motor vehicle fail and must permit normal angular movement without unnecessary slack (clause 6(3)(c)(i)-(ii)). The rear trailer safety chain must keep the rear trailer in tow with the lead trailer should the rigid coupling fail (clause 6(3)(d)). These are prescriptive mechanical and attachment duties for operators and manufacturers.

• Load and load‑carrying restrictions. Clause 6(3)(h) caps the loaded mass of a single traffic light trailer at 750 kilograms. Clause 6(3)(e) limits carriage to equipment associated with the traffic lights affixed to the trailer; carrying other items would breach the condition.

• Braking. Clause 6(3)(i) requires an efficient braking system fitted to at least one wheel of each end of at least one axle of the conjoined trailer unit, excluding a jockey wheel. This is an express equipment duty.

• Axle and tyre load ratings; ADR conformity. Clause 6(3)(j) requires the load carrying capacity of the axles and tyres in the non‑load sharing configuration to have a sufficient manufacturer rating and to be compliant with ADR 43/04 except for the load sharing suspension requirement. This is a duty to ensure design and ratings are adequate and to demonstrate compliance with the referenced ADR standard, with an express carve out.

• Design to withstand forces. Clause 6(3)(k) requires that connections and components of the conjoined trailer unit, and the tow vehicle used to tow it, be designed to withstand forces that may be applied. This allocates a design and selection duty to manufacturers and operators.

• Dimensional limit between axle centres. Clause 6(3)(l) limits the distance between axle centres of the lead and rear traffic light trailers to not exceed 2 metres. This imposes a dimensional specification duty.

• Manufacturer limits. Clause 6(3)(m) requires adherence to any manufacturer maximum speed or other limit applicable to the tow vehicle when towing the conjoined unit, if such a limit applies.

• Non‑operation of lights while under tow and permitted power sources. Clause 6(3)(f) prohibits each set of traffic lights being under operation while the unit is under tow. Clause 6(3)(g) restricts permitted power sources for the lights to solar and battery power or petrol or diesel motor power. This is a duty about operational states and permitted equipment power types.

Rights created by the notice

• Conditional exemption from regulation 32. Clause 6(2) provides the central legal right: while the conditions in clause 6(3) are satisfied, regulation 32 of the Vehicle Operations Regulations does not apply to a person towing a conjoined trailer unit with a light vehicle. That is a limited legal immunity from the operation of regulation 32, conditional on ongoing compliance.

Interaction with registration and defined terms

• Registration. By defining "traffic light trailer" to include the requirement that it be registered under the Vehicle and Traffic Act 1999, the notice effectively makes registration a precondition for any trailer forming part of a conjoined trailer unit (clause 3(1)). The notice does not itself create registration obligations but links its benefit to existence of registration under that Act.

Interpretive duties

• The Acts Interpretation Act 1931 applies to interpretation of the notice (clause 3(3)). That may affect computation of the three year period and other interpretive questions where the notice is ambiguous.

What happens on non‑compliance

• The notice makes the exemption subject to the listed conditions (clause 6(2)-(3)). If the conditions are not met, the exemption is not available; clause 6(2) disapplies regulation 32 only subject to clause 6(3). The notice itself does not state any penalty provisions; it creates only conditions for the exemption. Therefore a person who cannot demonstrate compliance will not be covered by the disapplication and will remain within the normal regulatory regime, including regulation 32, and any applicable enforcement or offence provisions in other instruments.

The notice does not itself specify any penalty provisions, infringement mechanisms, or a bespoke enforcement regime. It operates by creating a conditional exemption and by reference to existing statutes and regulations. The consequences and enforcement implications should be read from the structure of the instrument:

• No express penalties in the notice text. The instrument does not create offences, fines, or specific enforcement powers. It sets out eligibility conditions for an exemption and leaves broader enforcement, inspection and sanctioning to the underlying statutory and regulatory framework. This is evident from the absence of penalty clauses in clauses 1 through 6.

• Practical enforcement mechanism: compliance as a gateway to exemption. Clause 6(2) says regulation 32 does not apply to a person towing a conjoined trailer unit subject to clause 6(3). The practical effect is that the exemption is conditional. If an inspector or enforcement officer determines that the conditions in clause 6(3) are not met, the statutory disapplication will not attach and regulation 32 will continue to apply to that person. The notice therefore creates an evidential and compliance burden: operators must be prepared to demonstrate compliance with the technical and operational requirements in clause 6(3) if queried by enforcement officers.

• Interaction with existing enforcement frameworks. The notice references other legal instruments: the Vehicle and Traffic Act 1999 and the Vehicle Operations Regulations (clause 3(1)). Enforcement, penalties and administrative powers for breaches of vehicle operation or registration laws typically come from those instruments. The notice does not modify or displace those powers; instead it creates an exception to a specific regulation (regulation 32) while specifying conditions. In practice, sanctions for non‑compliance are therefore likely to arise under the Vehicle and Traffic Act 1999 and the Vehicle Operations Regulations outside the narrow exemption, but the notice does not itself identify those sanctions.

• Administrative responsibility and oversight. The notice states it is administered in the Department of State Growth and was made by the Transport Commission (administration note and heading). That allocation identifies who holds administrative responsibility for the notice, and by implication the agency that will field queries, issue guidance or carry out compliance checks. The Department will likely be the point at which compliance is clarified, although the notice does not specify enforcement procedures.

• Evidence and standards for compliance. The notice imports technical standards and manufacturer ratings as the benchmarks for compliance. For example, compliance with AS 4177.4‑2004 is required for safety chains (clause 6(1)), and ADR 43/04 conformity is required for axle and tyre load ratings subject to one exception (clause 6(3)(j)). These references provide objective technical standards that inspectors or auditors may use to assess whether the exemption conditions are satisfied. Operators should retain documentation showing conformance with those standards to support the application of the exemption.

• Consequence of relying on the exemption incorrectly. Because the instrument provides a conditional exemption, a person who uses a light vehicle to tow a conjoined trailer unit but fails to meet the conditions will not have the protection of clause 6(2). The notice does not specify civil liability effects, but failure to meet conditions will leave the person subject to regulation 32 and to any other applicable legal obligations under the Vehicle and Traffic Act 1999 and related instruments.

In summary, enforcement is primarily effected by reference to condition compliance. The notice does not create new penalties, but it sets technical and operational benchmarks and links exemption status to meeting those benchmarks. The Department of State Growth and the Transport Commission are the administrative actors identified in the instrument.

The notice expressly cross‑references multiple statutes, regulations and standards and therefore functions only in the context of the pre‑existing legislative and technical regime.

• Vehicle and Traffic (Vehicle Operations) Regulations 2024. The central interaction is with regulation 32 of the Vehicle Operations Regulations. Clause 6(2) disapplies regulation 32 for persons towing a conjoined trailer unit with a light vehicle, subject to clause 6(3). The notice does not amend regulation 32; it provides a temporary, conditional exception from its operation. The content of regulation 32 is not reproduced in the notice, so users and advisers must consult the Vehicle Operations Regulations to understand the underlying rules that are being set aside in the qualified circumstances identified by the notice.

• Vehicle and Traffic Act 1999. Clause 3(1) requires a traffic light trailer to be registered under the Vehicle and Traffic Act 1999. That renders registration a precondition for inclusion in a conjoined trailer unit and creates a point of contact with obligations and enforcement mechanisms under that Act, which the notice does not itself modify.

• Road Rules. Clause 3(1) imports the meaning of "traffic lights" from the Road Rules. The notice therefore depends on existing definitions in the Road Rules for what constitutes traffic lights, and that definition will be relevant if any interpretive questions arise about the equipment affixed to the trailer.

• Acts Interpretation Act 1931. Clause 3(3) brings the Acts Interpretation Act into play for interpretation of the notice. That means standard statutory interpretation rules and rules for computing time periods under that Act apply to questions such as the precise expiry date of the three year duration in clause 5(c) and other temporal or interpretive matters.

• Australian Standard AS 4177.4‑2004. Clause 6(1) defines "safety chain" as a chain compliant with AS 4177.4‑2004 Caravan and light trailer towing components, Part 4: Safety Chains up to 3500kg capacity. This incorporates a technical standard by reference so that safety chains must meet that standard to satisfy the notice condition.

• Vehicle Design Rules ADR 43/04. Clause 6(3)(j) requires compliance with ADR 43/04 in relation to axle and tyre load carrying capacity, except for ADR’s load sharing suspension requirement where the conjoined trailer unit is a non‑load sharing configuration. This leverages Australia’s ADR framework for vehicle component standards, but carves out one ADR requirement that would be inapplicable given the non‑load sharing arrangement described in the notice.

• Manufacturer limits and contractual documents. Clause 6(3)(m) requires not exceeding any manufacturer maximum speed or other limit specified for the tow vehicle when towing the unit. This brings manufacturer documentation and specifications into the compliance envelope. Those manufacturer limits will interact with road rules and regulatory speed limits; the notice does not alter statutory speed limits but requires adherence to manufacturer limits where applicable.

• Registration, certification and inspection regimes. Because the notice ties eligibility to registration under the Vehicle and Traffic Act and to compliance with ADRs and AS standards, it sits within the broader vehicle registration and certification ecosystem. Certificates of conformity, rating labels, manufacturer statements, load rating plates and registration records will be relevant evidence.

• No express amendment or suspension of other legal duties. The notice does not purport to amend the Vehicle and Traffic Act 1999, the Road Rules, or any other statutory duty. It only creates a limited exemption from regulation 32 subject to conditions. All other laws remain in force. For example, civil liability, insurance, and offences under other parts of the Vehicle and Traffic Act continue to apply although they are not expressly mentioned in the notice.

In short, the notice is a tailored, temporary exception that is dependent on registration and on compliance with technical and manufacturer standards. It should be read and applied in conjunction with the Vehicle Operations Regulations, the Vehicle and Traffic Act 1999, the Road Rules, the Acts Interpretation Act 1931 and the named technical standards.

This instrument is a single, standalone notice established in 2025. The notice text records the following chronological facts relevant to amendment history and lifecycle:

• Making and sealing. The Transport Commission made the notice at a meeting held on 5 March 2025. The common seal of the Transport Commission was affixed on that date and attested by the Commissioner for Transport (final administrative block).

• Notification and commencement. The notice was notified in the Gazette on 19 March 2025 and takes effect on 1 April 2025 (clause 2). Clause 5(c) fixes the duration of the exemption to a three year period commencing on the notice’s commencement date.

• Duration and expiry. Clause 5(c) states the exemption remains in force for a period of three years commencing on the date the notice takes effect. Clause 2 sets that commencement date at 1 April 2025. The notice also invokes the Acts Interpretation Act 1931 (clause 3(3)) for interpretation, which will govern the precise computation of the three year period and any legal day counts or inclusions under that Act. The notice itself does not make or record any amendments after the making date. No amending instruments are contained in or attached to the text provided.

• No previous iterations recorded in this text. The notice does not indicate that it amends or replaces a prior notice or instrument. It is presented as a new notice with a defined three year lifespan.

• Potential for future amendment or replacement. The instrument does not specify procedures for renewal, extension or amendment. Any future change would need to be effected by a new notice or by amendment under the procedures applicable to these rules, and will be subject to the usual statutory processes and any publication requirements under the Rules Publication Act 1953, which is referenced in the administrative block.

• Administrative responsibility. The notice is administered in the Department of State Growth. That allocation indicates which administrative body will manage the record keeping and any potential future amendment processes or guidance on application prior to expiry.

Because the text records only the initial making, notification and commencement dates and the fixed three year period, there is no recorded amendment history beyond the instrument’s creation and initial notices. Any subsequent amendments, extensions, or revocations would need to be located in later Gazette notices or in the consolidated statute/regulation records and are not included in the text provided.

The notice contains no internal record of litigation, court determinations, or tribunal decisions. It is newly made in 2025 and contains only the instrument’s operative text, commencement details and administration note. The text does not cite cases, prior decisions, or adjudications, and therefore there is no litigation history recorded within the notice itself.

Potential areas for dispute or legal challenge grounded in the notice language

• Factual questions of compliance. The exemption is conditional on a series of technical and operational requirements in clause 6(3). Enforcement or dispute is likely to turn on factual questions about whether those conditions were met at the relevant time. Examples of such factual disputes that the notice’s language could generate include whether the safety chain is "compliant with AS 4177.4‑2004", whether the coupling is "securely connected" and permits "no possibility of articulation, or rotation, along the axis of that coupling" (clause 4(2)(b) and clause 6(1)), whether the braking requirement has been satisfied, and whether the loaded mass of a trailer exceeds 750 kilograms (clause 6(3)(h)-(i)).

• Interpretive ambiguity. Some phrases in the notice will require interpretation, for example "designed and built for the purposes of being connected to, and towed with, another traffic light trailer" (clause 3(1) definition of traffic light trailer), "no possibility of articulation, or rotation, along the axis of that coupling" (clause 4(2)(b)(i)), and the requirement that the safety chain permit "normal angular movement of the coupling ... without unnecessary slack" (clause 6(3)(c)(ii)). Disputes could arise over the meaning of "normal angular movement" or "unnecessary slack" and whether a particular coupling design satisfies those criteria.

• Compliance with ADR and AS standards. Clause 6(3)(j) requires adherence to ADR 43/04 except for the load sharing suspension requirement, and clause 6(1) requires safety chains to be compliant with AS 4177.4‑2004. Disputes could turn on technical evidence about whether a given axle, tyre set or chain meets the standard, and whether the "sufficient manufacturer rating" threshold has been met.

• Manufacturer identity and conformity. Clause 4(2)(c) requires both traffic light trailers to be manufactured by the same manufacturer. That could give rise to disputes where trailers are modified, rebadged, or assembled from components sourced from multiple manufacturers. Determining the "manufacturer" for the purposes of the clause may involve contract and product‑labelling evidence.

• Interaction with regulation 32. Since the exemption is framed as a disapplication of regulation 32 subject to the conditions, litigation could arise where an operator claims the exemption applies while an enforcement agency asserts regulation 32 applies. That would generate a legal issue as to whether the conditions were satisfied at the relevant time.

Because the notice contains no reported litigation or cases, the above points are descriptive of the types of disputes that the notice’s text could generate. Any actual litigation would arise in a court or tribunal applying the notice in the context of the broader statutory and regulatory framework, and those decisions are not recorded in the text provided.

The notice contains a number of precise technical and operational constraints that may catch operators, manufacturers and drivers unaware if they rely on a superficial reading. Key practical pitfalls to watch for, with clause references:

• Registration requirement for each traffic light trailer. The definition of "traffic light trailer" requires registration under the Vehicle and Traffic Act 1999 (clause 3(1)). If a trailer used in the conjoined unit lacks the requisite registration record, the configuration will not satisfy the notice’s preconditions. Ensure registration for each trailer is current and that registration documents are available.

• Same manufacturer requirement. Clause 4(2)(c) requires both traffic light trailers to be manufactured by the same manufacturer. Operators that couple together trailers from different manufacturers will not meet the definition of a conjoined trailer unit under clause 4 and therefore will not be within the exemption. Modified or retrofitted trailers where original manufacture is unclear may present evidence challenges.

• Rigid coupling and "no possibility of articulation or rotation" wording. Clause 4(2)(b)(i) requires a rigid coupling mechanism so that there is "no possibility of articulation, or rotation, along the axis of that coupling". This is a high‑threshold textual requirement. At the same time clause 6(3)(c)(ii) requires the safety chain to permit "normal angular movement of the coupling ... without unnecessary slack". The interplay of a "rigid coupling" that nevertheless allows normal angular movement creates a narrow technical design window. Operators should obtain manufacturer documentation and engineering certification that the coupling meets both requirements as drafted.

• Safety chain attachment complexity. Clause 6(3)(b)-(d) requires two safety chains and very specific attachment relationships: one fitted to the lead trailer and attached to the towing vehicle, and one attached to the rear trailer and to the lead trailer while being towed. The lead chain must keep the trailer in tow if the coupling to the motor vehicle fails (clause 6(3)(c)(i)). The rear chain must keep the rear trailer in tow with the lead trailer should the rigid coupling fail (clause 6(3)(d)). Failure to rig the chains exactly as required, or use non‑compliant chains, will remove the exemption. Note also that the definition of "safety chain" references AS 4177.4‑2004 (clause 6(1)), so chains must meet that standard.

• Braking requirement may be misunderstood. Clause 6(3)(i) requires "an efficient braking system ... fitted to at least one wheel of each end of at least one axle", other than a jockey wheel. The phrasing is not the ordinary form of specifying braking on an axle and could confuse designers. It will be important to interpret and document how the braking arrangement meets the clause, and to retain evidence that demonstrates an "efficient braking system" exists in the configuration required.

• Mass limit per trailer. Clause 6(3)(h) caps the loaded mass of a single traffic light trailer at 750 kilograms. Operators must not only measure the tare weight but also confirm that the loaded mass transferred to the towbar and transmitted to the ground by the axle does not exceed that limit. Loading practices that vary between trips could cause inadvertent breaches.

• Non‑operation of traffic lights while under tow. Clause 6(3)(f) bars each set of traffic lights from being under operation while the unit is under tow. A practical trap is inadvertent activation of equipment during transit. Ensure procedures and checks prevent lights from being powered while towing.

• Power source restrictions. Clause 6(3)(g) restricts permitted power sources for the sets of traffic lights to either solar and battery power, or petrol or diesel motor power. Alternative power systems, such as external mains hookup or other generator types, are not authorised by the notice text when the condition is read strictly.

• ADR and load sharing carve out. Clause 6(3)(j) requires compliance with ADR 43/04, but explicitly allows the non‑load sharing configuration to fail the ADR requirement that axles be related by load sharing suspension. Operators should not assume all ADR requirements are waived. They must ensure axle and tyre load ratings have a sufficient manufacturer rating and otherwise comply with ADR 43/04.

• Distance between axle centres. Clause 6(3)(l) sets a maximum 2 metre distance between the axle centre of the lead trailer and the axle centre of the rear trailer. Trailer combinations with longer wheelbase separations will fall outside the exemption.

• Manufacturer speed limits. Clause 6(3)(m) requires the tow vehicle not exceed any maximum speed or other limit specified by the manufacturer for that unit. Where a manufacturer imposes a low speed limit when towing certain trailer configurations, that limit controls even if public road speed limits are higher.

• Temporal expiry and planning. The exemption is temporary for three years from commencement (clause 5(c) and clause 2). Operators planning long term changes to fleet logistics should not rely on the exemption beyond its term unless and until it is renewed, replaced or otherwise extended by further instrument.

• Evidence and documentation requirements. The notice relies heavily on constructor, manufacturer and standard compliance. There is no prescribed form of proof in the notice. Operators should retain manufacturer statements, test certificates, load rating plates, chain compliance documentation to AS 4177.4‑2004, and records of trailer registration to show eligibility.

• No express guidance on regulator discretion. The notice does not specify how compliance will be assessed, which documents suffice or how enforcement discretion will be exercised. That absence creates practical uncertainty at checkpoints or during inspections.

These "gotchas" flow directly from the notice wording and the interplay of technical requirements, registration prerequisites and operational restrictions. They point to the need for careful documentary compliance and conservative operational procedures when relying on the exemption.

This checklist is a practical compliance roadmap grounded in the notice text. It identifies the documents, physical modifications and operational procedures likely needed to demonstrate that a conjoined trailer unit qualifies for the exemption in clause 6(2) and meets the conditions in clause 6(3).

1. Confirm trailer identity and registration

   • Verify each trailer meets the definition of "traffic light trailer" in clause 3(1): single axle, affixed with one set of traffic lights, designed and built to be connected to another traffic light trailer, and registered under the Vehicle and Traffic Act 1999. Maintain copies of registration certificates for each trailer and any manufacturer or design documentation showing the trailer was designed for conjoining.

2. Confirm common manufacturer

   • Obtain manufacturer documentation or a statement confirming that both traffic light trailers were manufactured by the same manufacturer, as required by clause 4(2)(c). If trailers were remanufactured or modified, secure a manufacturer confirmation or engineer’s certificate addressing the manufacturer identity question.

3. Coupling design and certification

   • Ensure the coupling mechanism is a rigid coupling that secures the lead and rear trailers in the lead/rear configuration required by clause 4(2)(a) and clause 4(2)(b). The coupling must prevent articulation or rotation along its axis (clause 4(2)(b)(i)) while allowing the assembly to move as a single trailer when under tow (clause 4(2)(b)(ii)).
   • Obtain an engineering statement or manufacturer certificate demonstrating the coupling meets these requirements and that the assembly meets clause 4.

4. Safety chains compliant with AS 4177.4‑2004

   • Fit two safety chains that meet AS 4177.4‑2004 as defined in clause 6(1). One chain must be fitted to the lead trailer and attached to the tow vehicle. The other must be attached to the rear trailer and secured to the lead trailer while being towed (clause 6(3)(b)).
   • Ensure the lead trailer safety chain is built and fitted to keep the trailer in tow should the coupling to the motor vehicle fail and permits "normal angular movement" without unnecessary slack (clause 6(3)(c)(i)-(ii)). Ensure the rear trailer chain keeps the rear trailer in tow with the lead trailer if the rigid coupling fails (clause 6(3)(d)).
   • Retain manufacturer specifications, chain certificates and fitting instructions showing compliance with AS 4177.4‑2004.

5. Braking system compliance

   • Fit an efficient braking system to the conjoined trailer unit as specified in clause 6(3)(i): to at least one wheel of each end of at least one axle, excluding a jockey wheel. Obtain documentation from the manufacturer or a qualified mechanic certifying that the braking arrangement meets this requirement and is efficient for the intended loaded mass.

6. Axle and tyre load capacity; ADR conformity

   • Obtain and retain the manufacturer rating for axles and tyres demonstrating a "sufficient manufacturer rating" for the non‑load sharing configuration, as required by clause 6(3)(j)(i). Ensure the configuration conforms to ADR 43/04 except for the load sharing suspension requirement that the notice explicitly makes inapplicable (clause 6(3)(j)(ii)).
   • Secure written evidence or certificates of ADR conformity for the applicable aspects of ADR 43/04 to show compliance.

7. Mass and load restrictions

   • Confirm the loaded mass of each single traffic light trailer will not exceed 750 kilograms when in service (clause 6(3)(h)). Implement loading procedures or weight checks to prevent overloading. Maintain calibration records for weighing equipment used to verify loaded mass.

8. Limit carriage to traffic light equipment

   • Ensure that each traffic light trailer is not loaded with or used to carry material other than equipment associated with the traffic lights affixed to the trailer (clause 6(3)(e)). Implement pre‑departure checklists to verify permissible cargo only.

9. Ensure traffic lights are not operational during towing; comply with power source restriction

   • Make sure that each set of traffic lights is switched off and not under operation while the unit is under tow (clause 6(3)(f)). If servicing or transporting lights in a powered state is necessary on occasion, ensure an alternative lawful arrangement is used because operation while under tow is prohibited.
   • If lights are to be powered for any purpose consistent with other rules, ensure their on‑board power source is either solar and battery power or petrol or diesel motor power as specified in clause 6(3)(g).

10. Dimensional compliance

    • Measure and document the distance between the axle centre of the lead trailer and the axle centre of the rear trailer to ensure it does not exceed 2 metres (clause 6(3)(l)). Keep installation records showing compliance.

11. Design to withstand forces; tow vehicle suitability

    • Ensure connections, components and the tow vehicle are designed and rated to withstand the forces likely to be applied during towing (clause 6(3)(k)). Obtain engineering or manufacturer statements confirming structural adequacy for the intended towing tasks.

12. Observe manufacturer towing limits

    • Check whether the tow vehicle or the trailer manufacturer specifies a maximum speed or other conditions for towing the unit. If such limits exist, ensure they are not exceeded when towing under the exemption (clause 6(3)(m)). Document the applicable manufacturer limits and operational procedures to adhere to them.

13. Documentation for inspections

    • Prepare a compliance folder to carry or make available on request to an enforcement officer. The folder should include registration certificates for each trailer, manufacturer statements confirming common manufacture and design specifics, coupling design documentation, AS 4177.4‑2004 compliance evidence for safety chains, ADR conformity evidence for relevant components, brake system certificates, load ratings, weight check records, inspection records and a pre‑departure checklist confirming lights are not operational.

14. Administrative liaison

    • Note that the notice is administered by the Department of State Growth. Keep the Department’s contact details on hand for queries, and monitor for any departmental guidance or updates. Because the notice is temporary, maintain an administrative log to track the expiry date and any regulatory developments ahead of the notice’s three year term ending.

15. Audit and training

    • Implement driver and loader training in the new procedures, including how to couple and uncouple safely, how to attach safety chains exactly as required, pre‑departure checks, and weight checks. Keep a log of training, inspections and maintenance work.

16. Contingency planning for post‑expiry

    • The exemption lasts three years from commencement (clause 5(c) and clause 2). Establish a plan for how vehicles and operations will comply after the expiry date if the exemption is not renewed, including identification of alternative tow vehicles or additional compliance measures that would be required under regulation 32 and related instruments.

Following this checklist will help demonstrate that a particular conjoined trailer unit and its towing arrangement meet the conditions in clause 6(3) so that the exemption in clause 6(2) applies. Operators should keep clear, dated records and manufacturer statements to support compliance claims during inspections or disputes.