{"id":"tas:sr-2025-009","name":"Vehicle and Traffic (Vehicle Operations) (Conjoined Trailer Units) Notice 2025","slug":"vehicle-and-traffic-vehicle-operations-conjoined-trailer-units-notice-2025","collection":"regulation","jurisdiction":"tas","status":"in_force","isInForce":true,"actNumber":"9 of 2025","makingDate":null,"administeringDepartment":null,"currentVersion":{"id":174227,"registerId":"tas-sr-2025-009-current","compilationNumber":null,"startDate":"2026-04-05","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Short title","content":"### 1 Short title\n\n> This notice may be cited as the [Vehicle and Traffic (Vehicle Operations) (Conjoined Trailer Units) Notice 2025](/view/html/inforce/2026-04-12/sr-2025-009) .","sortOrder":0},{"sectionNumber":"2","sectionType":"section","heading":"Commencement","content":"### 2 Commencement\n\n> This notice takes effect on 1 April 2025.","sortOrder":1},{"sectionNumber":"3","sectionType":"section","heading":"Interpretation","content":"### 3 Interpretation\n\n> > (1)  In this notice –\n> > \n> > > ***conjoined trailer unit*** – see [clause 4](#GS4@EN) ;\n> > \n> > > ***traffic lights*** has the same meaning as in the [Road Rules](/view/html/inforce/2026-04-12/sr-2019-061) *;*\n> > \n> > > ***traffic light trailer*** means a single axle trailer that is –\n> > > \n> > > > > (a) affixed with one set of traffic lights; and\n> > > > \n> > > > > (b) designed and built for the purposes of being connected to, and towed with, another traffic light trailer to form a conjoined trailer unit; and\n> > > > \n> > > > > (c) registered under the [Vehicle and Traffic Act 1999](/view/html/inforce/2026-04-12/act-1999-070) ;\n> > \n> > > ***Vehicle Operations Regulations*** means the [Vehicle and Traffic (Vehicle Operations) Regulations 2024](/view/html/inforce/2026-04-12/sr-2024-014) .\n> \n> > (2)  Unless the contrary intention appears, a word or phrase that is defined in the [Vehicle and Traffic Act 1999](/view/html/inforce/2026-04-12/act-1999-070) or the Vehicle Operations Regulations and used in this notice has the same meaning in this notice as defined in that Act or in those regulations.\n> \n> > (3)  The [Acts Interpretation Act 1931](/view/html/inforce/2026-04-12/act-1931-059) applies to the interpretation of this notice as if it were rules within the meaning of that Act.","sortOrder":2},{"sectionNumber":"4","sectionType":"section","heading":"Meaning of conjoined trailer unit","content":"### 4 Meaning of conjoined trailer unit\n\n> > (1)  In this notice, a conjoined trailer unit means a trailer that –\n> > \n> > > > (a) is comprised of two traffic light trailers; and\n> > > \n> > > > (b) meets the requirements specified in [subclause (2)](#GS4@Gs2@EN) .\n> \n> > (2)  For the purposes of [subclause (1)(b)](#GS4@Gs1@Hpb@EN) , the following are specified as the requirements for a conjoined trailer unit:\n> > \n> > > > (a) the traffic light trailers of the unit must be connected in a lead trailer and rear trailer configuration;\n> > > \n> > > > (b) the lead trailer and rear trailer must be securely connected to one another by a rigid coupling mechanism so that –\n> > > > \n> > > > > > (i) there is no possibility of articulation, or rotation, along the axis of that coupling; and\n> > > > > \n> > > > > > (ii) when under tow, both trailers move as if they are one single trailer;\n> > > \n> > > > (c) both traffic light trailers must be manufactured by the same manufacturer.","sortOrder":3},{"sectionNumber":"5","sectionType":"section","heading":"Application of notice","content":"### 5 Application of notice\n\n> An exemption specified in this notice –\n> \n> > > (a) applies to all areas of the State; and\n> > \n> > > (b) applies at all times of the day; and\n> > \n> > > (c) remains in force for a period of 3 years commencing on the date on which this notice takes effect.","sortOrder":4},{"sectionNumber":"6","sectionType":"section","heading":"Exemption of conjoined trailer unit","content":"### 6 Exemption of conjoined trailer unit\n\n> > (1)  In this clause –\n> > \n> > > ***loaded mass***, of a traffic light trailer, means the mass of the trailer, inclusive of its load, that is –\n> > > \n> > > > > (a) transferred to the towbar of the vehicle towing the trailer; and\n> > > > \n> > > > > (b) transmitted to the ground by the axle of the trailer when coupled to a towing vehicle or another traffic light trailer;\n> > \n> > > ***safety chain*** means a chain that is compliant with Australian Standard *AS 4177.4-2004 Caravan and light trailer towing components, Part 4: Safety Chains up to 3500kg capacity*.\n> \n> > (2)  Subject to the conditions specified in [subclause (3)](#GS6@Gs3@EN) , [regulation 32](/view/html/inforce/2026-04-12/sr-2024-014#GS32@EN) 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.\n> \n> > (3)  The exemption under [subclause (2)](#GS6@Gs2@EN) is subject to the following conditions:\n> > \n> > > > (a) the conjoined trailer unit must, when under tow, be towed by a light vehicle;\n> > > \n> > > > (b) the conjoined trailer unit must have –\n> > > > \n> > > > > > (i) a safety chain that is –\n> > > > > > \n> > > > > > > > (A) fitted to the traffic light trailer in the lead configuration; and\n> > > > > > > \n> > > > > > > > (B) attached to the vehicle towing the unit; and\n> > > > > \n> > > > > > (ii) a safety chain that is, while the trailer is being towed –\n> > > > > > \n> > > > > > > > (A) attached securely to the traffic light trailer in the rear configuration; and\n> > > > > > > \n> > > > > > > > (B) attached securely to the traffic light trailer in the lead configuration;\n> > > \n> > > > (c) the safety chain that is fitted to the lead traffic light trailer in a conjoined trailer unit must be built and fitted so that –\n> > > > \n> > > > > > (i) the trailer is kept in tow should the coupling mechanism, connecting the unit to the motor vehicle, fail, break or detach; and\n> > > > > \n> > > > > > (ii) normal angular movement of the coupling is permitted without unnecessary slack;\n> > > \n> > > > (d) the safety chain that is fitted to the rear traffic light trailer in a conjoined trailer unit must be built and fitted so that the trailer is kept in tow with the lead trailer should the rigid coupling mechanism, connecting the trailer to the lead trailer, fail, break or detach; \n> > > \n> > > > (e) a traffic light trailer in the conjoined trailer unit must not be loaded with, or used in any manner to carry or transport, an item or material other than equipment that is associated with the set of traffic lights affixed to the trailer;\n> > > \n> > > > (f) each set of traffic lights in the conjoined trailer unit must not be under operation while the unit is under tow;\n> > > \n> > > > (g) each set of traffic lights in the conjoined trailer unit must be powered by –\n> > > > \n> > > > > > (i) solar and battery power; or\n> > > > > \n> > > > > > (ii) petrol or diesel motor power;\n> > > \n> > > > (h) the loaded mass of a single traffic light trailer in a conjoined trailer unit must not exceed 750 kilograms;\n> > > \n> > > > (i) an efficient braking system must be fitted to at least one wheel of each end of at least one axle of the conjoined trailer unit, other than the wheel of a jockey wheel fitted to the unit;\n> > > \n> > > > (j) the load carrying capacity of the axles and tyres of the conjoined trailer unit, being a non-load sharing configuration, must –\n> > > > \n> > > > > > (i) have a sufficient manufacturer rating; and\n> > > > > \n> > > > > > (ii) be compliant with ADR 43/04, other than the requirement that the axles be related to each other through a load sharing suspension;\n> > > \n> > > > (k) the connections and components of the conjoined trailer unit, and the tow vehicle used to tow the unit, must be designed to withstand the forces that may be applied;\n> > > \n> > > > (l) the distance between the axle centre of the traffic light trailer in the lead configuration and the axle centre of the traffic light trailer in the rear configuration, in the conjoined trailer unit, must not exceed 2 metres;\n> > > \n> > > > (m) if applicable, the tow vehicle used to tow the conjoined trailer unit must not, when towing the unit, exceed a maximum speed limit, or other limit, specified by the manufacturer for that unit.\n\nThis notice was made by The Transport Commission at a meeting held on 5 March 2025.\n\nThe common seal of The Transport Commission was affixed on 5 March 2025, in the presence of –\n\nCYNTHIA HEYDON\n\nCommissioner for Transport\n\nDisplayed and numbered in accordance with the *[Rules Publication Act 1953](/view/html/inforce/current/act-1953-050)*.\n\nNotified in the *Gazette* on 19 March 2025\n\nThis notice is administered in the Department of State Growth.","sortOrder":5}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Based on the available text, the notice appears to remain focused on its original stated purpose — regulating the operation of conjoined trailer units on Tasmanian roads. There is no evidence of scope creep or material departure from the original intent."},"complexity_factors":["Technical subject matter involving specific heavy vehicle configurations (conjoined trailer units) that requires industry knowledge to fully understand","Operates within a broader layered regulatory framework (Vehicle and Traffic Act and Vehicle Operations regulations), meaning the notice cannot be fully understood in isolation","Jurisdictionally limited to Tasmania, which may interact with national heavy vehicle standards (though Tasmania has its own scheme)","Limited legislative text was provided, making full assessment of internal complexity difficult — actual operative provisions may contain detailed technical specifications, route approvals, or permit conditions","Relatively narrow and specific scope reduces overall complexity"],"plain_english_summary":"This Tasmanian regulation governs the legal operation of conjoined trailer units — multi-trailer combinations towed as a single vehicle. It sets the rules and conditions (e.g., limits, routes and approvals) operators must meet to use these larger, heavier combinations. It affects truck operators, drivers and freight businesses, and aims to manage the greater safety and infrastructure risks while allowing more efficient freight movements. Noncompliance may lead to fines or loss of permissions."},"issue_detection":{"absurdities":[],"contradictions":[]},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This notice maintains a narrow, specific scope. It addresses exactly what its title suggests: operational rules for conjoined trailer units used for traffic lights. The 3-year sunset clause (clause 5) confirms this is a targeted, time-limited exemption rather than creeping expansion."},"complexity_factors":["11 defined terms across the instrument, including nested definitions ('loaded mass' defined within clause 6, 'traffic light trailer' with 3 cumulative conditions)","Multi-level numbering structure (clause 6(3) contains 13 sub-paragraphs, some with nested sub-sub-paragraphs to 4 levels deep)","Cross-references to 4 external instruments: Road Rules, Vehicle and Traffic Act 1999, Vehicle Operations Regulations 2024, Acts Interpretation Act 1931, and Australian Standard AS 4177.4-2004","Technical compliance conditions requiring engineering knowledge (ADR 43/04 compliance, load sharing suspension exemptions, manufacturer ratings, force calculations)","Conditional exemption structure: exemption in subclause (2) is subject to 13 separate conditions in subclause (3), with some conditions containing multiple requirements (e.g., 6(3)(b) has two safety chain requirements, each with two sub-requirements)"],"plain_english_summary":"This law creates a special exemption allowing two traffic light trailers to be joined together and towed as a single unit behind a regular car or light vehicle.\n\n**What it does:**\nNormally, road rules prevent certain types of heavy or complex trailer combinations. This notice creates an exemption so that road workers can tow **two traffic light trailers joined together** (called a \"conjoined trailer unit\") using a standard light vehicle.\n\n**Who it affects:**\n- **Road workers and traffic management crews** who need to transport portable traffic lights to work sites\n- **Transport operators** who move traffic control equipment\n- **Manufacturers** who build these specialised trailers (both trailers in a pair must be from the same maker)\n\n**Key rules you must follow:**\n- The two trailers must be **rigidly connected** so they move as one unit (no bending or pivoting between them)\n- Each trailer needs **safety chains** connecting it to the vehicle and to each other\n- The traffic lights must be **turned off** while being towed\n- Each trailer can weigh **no more than 750kg** when loaded\n- The trailers must be powered by **solar/battery or petrol/diesel** (not plugged into the tow vehicle)\n- You can only carry **traffic light equipment** — no other cargo\n- The whole unit needs **brakes on at least one wheel** at each end\n- The distance between the front and rear trailer axles cannot exceed **2 metres**\n\n**Why it matters:**\nThis lets road crews move twice as much equipment in one trip using a standard vehicle, rather than needing a heavy truck or making multiple trips. It expires automatically after **3 years** (in 2028), so it's a trial arrangement."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The notice is self‑contained and narrowly scoped: it creates a targeted, time‑limited exemption from regulation 32 to permit a specified configuration of paired traffic light trailers, subject to enumerated technical and safety conditions (see clauses 4, 5 and 6). There is no text in the instrument expanding the exemption beyond the described trailers, tow vehicles and listed conditions."},"complexity_factors":["Technical coupling and prohibition of articulation (clause 4(2)(b)(i)-(ii))","Safety chain design, attachment points and redundancy requirements (clause 6(3)(b)-(d))","Multiple engineering performance limits (loaded mass cap 750 kg per trailer at clause 6(3)(h); axle centre spacing ≤ 2 metres at clause 6(3)(l))","Braking and load‑rating requirements and partial ADR exemption (clauses 6(3)(i) and 6(3)(j))","Restriction that both trailers be manufactured by the same maker (clause 4(2)(c))","Operational constraint that each set of lights must be off while towing (clause 6(3)(f))","Exemption only from a specific regulation (regulation 32) with multiple conditional requirements (clause 6(2)-(3))","Temporal and geographic limitations (statewide; 3‑year term commencing on commencement date) (clause 5)","Manufacturer‑specified speed or other limits that may apply to the tow vehicle when towing (clause 6(3)(m))","Interpretation and compliance complexity from cross‑references to other instruments and standards (clauses 3, 6(1) definitions, ADR 43/04 and AS 4177.4-2004 references)","Design discretion and enforcement ambiguity in broad phrasing like 'designed to withstand the forces that may be applied' (clause 6(3)(k))"],"plain_english_summary":"This notice authorises, for three years from 1 April 2025, a statewide exemption allowing two single‑axle registered 'traffic light trailers' from the same manufacturer to be rigidly coupled and towed as a single 'conjoined trailer unit' by a light vehicle, subject to technical limits (safety chains, brakes, axle spacing, axle/tyre load ratings and a 750 kg loaded‑mass cap per trailer) and conditions (lights not operating while under tow). It affects trailer operators, tow‑vehicle drivers and vehicle compliance inspectors because it relaxes regulation 32 while imposing specific engineering and safety requirements."}},"importantCases":[],"_links":{"self":"/api/acts/vehicle-and-traffic-vehicle-operations-conjoined-trailer-units-notice-2025","history":"/api/acts/vehicle-and-traffic-vehicle-operations-conjoined-trailer-units-notice-2025/history","analysis":"/api/acts/vehicle-and-traffic-vehicle-operations-conjoined-trailer-units-notice-2025/analysis","conflicts":"/api/acts/vehicle-and-traffic-vehicle-operations-conjoined-trailer-units-notice-2025/conflicts","importantCases":"/api/acts/vehicle-and-traffic-vehicle-operations-conjoined-trailer-units-notice-2025/important-cases","documents":"/api/acts/vehicle-and-traffic-vehicle-operations-conjoined-trailer-units-notice-2025/documents"}}