The central concept is the road obstruction power, defined by s 2A(4) as the powers conferred by s 4(1) (affixing a notice), s 5(1) (seizing, moving, modifying, dismantling, unloading, interfering, replacing, or destroying a vehicle), and s 5(3) (impounding a vehicle). These powers are temporally limited. They can be exercised only during a period specified in an order of the Governor, and that period cannot exceed three months (s 2A(1), (2)). The order must be published on the NSW legislation website, and the period commences on the date of publication or a later date specified in the order (s 2A(3)). This means the Act is not a permanent grant of police power but a contingency law that the government can switch on and off. A public road is defined by reference to s 4(1) of the Road Transport Act 2013, but excludes roads or road related areas that are the subject of a declaration under s 18(1)(b) of that Act relating to all its provisions (s 3(1)). This means the Act applies broadly to most roads and road related areas (including footpaths, nature strips, and traffic islands) but not to roads that have been declared to be outside the Road Transport Act entirely (such as some private roads or closed roads). A motor vehicle is defined by reference to the Road Transport Act 2013 and includes a trailer (s 3(1)). Importantly, a reference to a motor vehicle includes any goods on the motor vehicle (s 3(2)). This means the powers extend to cargo, and the regulations may provide for compensation if goods are damaged (s 10(1)(d)). Owner is defined expansively: any joint or part owner, any person who has use of the vehicle under a hiring or hire-purchase agreement, and any Australian registered operator under the Road Transport Act 2013, but expressly does not include an unpaid vendor of a vehicle under a hire-purchase agreement (s 3(1)). This means the legal owner under a hire-purchase finance arrangement (the financier) is not an owner for the purposes of owner liability under s 4(5) or cost recovery under s 8, even though the hirer is. An authorised officer is a police member of or above the rank of sergeant, or a police officer who is for the time being in charge of a police station (s 3(1)). This does not include ordinary constables or non-police traffic officers. Commissioner means Commissioner of Police. The notice is a prescribed form (Schedule 1) that must state the directions for movement and warn of penalties, including the maximum fine of ten penalty units (currently $1,100 if the penalty unit is $110, though the Act predates current unit values), mandatory licence disqualification of at least one month, owner liability, and the possibility of vehicle forfeiture if another notice was affixed within the previous three months. The Act also uses the concept of practicability: the destruction power under s 5(1) is only available when the Commissioner or authorised officer is of the opinion that it is not practicable to move the vehicle or any part of it. This introduces a subjective judgment that is not expressly reviewable, but s 7 protects even purported exercises of the power, so a mistake as to practicability does not give rise to a damages claim.

The Act directly affects drivers who last drove a vehicle to which a notice is affixed. They face a mandatory duty to move the vehicle forthwith per the directions and a prohibition on immobilising it. Non-compliance results in a criminal conviction, a fine, and an automatic driving disqualification of at least one month, which can be extended by the court to up to three years (s 4(4)). The driver is also exposed to an absolute liability offence (s 4(7)), meaning no defence of honest and reasonable mistake is available. Owners of motor vehicles are affected even if they were not the driver. Section 4(5) makes the owner guilty of an offence and liable to a fine of up to ten penalty units if an offence under s 4(3) is committed in relation to the vehicle, whether or not the driver has been convicted. This is not stated to be absolute liability, so a prosecution would need to prove the owner had some connection or knew of the notice, but the provision is drafted broadly. Owners also face the risk of forfeiture of the vehicle to the Crown if a second notice is affixed within three months (s 4(6)). Forfeiture can be ordered by the court in addition to the fine. Owners are also liable for the costs and expenses of seizure, impounding, and disposal, as well as any liability of the Commissioner or officers arising from the operation, including negligence (s 8). This liability is enforced by a conclusive certificate of the Commissioner, which can be sued upon as a debt in any court of competent jurisdiction. The owner has no apparent right to challenge the quantum or reasonableness of those costs before the certificate. The Crown is protected from liability for damage to the vehicle or loss of its use (s 7), but the Act contemplates that regulations may provide for compensation to persons whose goods are damaged or whose land is taken possession of under s 5(2) (s 10(1)(d)). Persons engaged by police to move or destroy vehicles are also exculpated from liability under s 7, provided they are acting pursuant to the purported exercise of powers. Anyone who obstructs, hinders, assaults, or resists a person engaged in doing anything under s 5(1) or (3) commits an offence punishable by up to six months imprisonment (s 5(5)). This includes obstruction of a purported exercise of power, so a person who physically blocks police from moving a vehicle may face criminal liability even if the police have misapplied the Act. Lessees and financiers are affected differently: a hirer or hire-purchaser is an owner, but an unpaid vendor under a hire-purchase agreement is not. This means a finance company that has not been fully paid is not liable for the owner offence or costs, but the hirer is. Landowners are affected because police may take possession of any land, privately owned or not, for the purpose of exercising s 5(1) powers (s 5(2)). There is no requirement to give notice to the landowner, and no express right of compensation (only by regulation). The courts (Local Court) hear proceedings for offences (s 9) and can order forfeiture.

Duty of the last driver: Upon a notice being affixed to a motor vehicle, the person who last drove it before the notice was affixed must forthwith move the vehicle in accordance with the directions contained in the notice and within the time specified (s 4(2)(a)). This duty does not apply to the owner who did not drive; it attaches only to the last driver. If multiple people drove the vehicle before the notice was affixed, there may be uncertainty, but the section literally imposes the duty on "the person who last drove the motor vehicle before the notice was affixed to it". That person must not, before the directions are complied with, do anything to render the vehicle immobile (s 4(2)(b)). This prohibits actions such as removing a wheel, flattening tyres, or engaging a brake that cannot be released, but presumably does not prohibit ordinary parking. Rights of the police: The Commissioner or an authorised officer has the right to form an opinion that a vehicle ought to be moved to prevent obstruction and to affix a notice (s 4(1)). After the time for compliance expires, they have the right to seize, move, modify, dismantle, unload, interfere with, or replace the vehicle, or any part of it, to enable movement, or to destroy it if they consider it not practicable to move it (s 5(1)). They also have the right to take possession of any land, public or private, for this purpose (s 5(2)), and to impound the vehicle (s 5(3)). They may move the vehicle by driving it (whether under power or not), towing, pushing, or any other manner (s 5(4)). Rights of the owner: The owner may reclaim the vehicle from impoundment, subject to regulations (s 10(1)(a)). The regulations are expected to prescribe conditions for release, such as payment of costs. The owner can challenge proceedings for an offence in the Local Court (s 9) and can argue against an order for forfeiture (s 4(6)). However, the Act does not provide a statutory right to prior notice of seizure or destruction. The owner can also seek compensation for damage to goods on the vehicle or for land taken, but only if and to the extent that regulations provide for such compensation (s 10(1)(d)). Right to recover costs: The Minister has a right to recover costs and expenses from the owner as a debt due to the Crown, certified conclusively by the Commissioner (s 8). The owner has no statutory right to challenge the certificate in the same proceeding; the certificate is admissible and conclusive. The only potential avenue would be to argue that the certificate does not comply with the Act (e.g., it was not signed by the Commissioner) or that the costs were not incurred in respect of the exercise of powers under s 5(1) or (3). Exculpation: The Crown, Commissioner, authorised officers, and persons engaged in doing anything under s 5(1) or (3) have a right not to be liable for any damage (howsoever caused, including negligence) to the motor vehicle, or for any loss or damage suffered in respect of loss of use of the vehicle (s 7). This right is subject to regulations, which could provide for exceptions.

Primary offence: Contravening s 4(2) (failure to move the vehicle or rendering it immobile) is an offence under s 4(3) punishable by a fine not exceeding ten penalty units. As of the current penalty unit value under the Crimes (Sentencing Procedure) Act 1999, ten penalty units is $1,100 (since a penalty unit is $110). The offence is one of absolute liability (s 4(7)), meaning the prosecution does not need to prove fault, and no defence of honest and reasonable mistake is available. This is a significant departure from the usual strict liability standard for traffic offences. Automatic disqualification: Upon conviction, the person is disqualified from holding any driver licence under the Road Transport Act 2013 for a period of one month (s 4(4)). The court may also order disqualification for a longer period not exceeding three years. This disqualification applies to any licence, not just the licence of the class of vehicle obstructed. Owner liability: Section 4(5) makes the owner of the vehicle guilty of an offence and liable to a penalty not exceeding ten penalty units where an offence under s 4(3) is committed in relation to that vehicle. This does not require the owner to have driven the vehicle or to have known about the notice. The provision does not state that the owner offence is absolute liability, so the usual default under the Criminal Procedure Act 1986 (which requires proof of mens rea for non-absolute offences) may apply. However, the section uses the phrase "is guilty of an offence" without specifying a mental element, potentially making it a strict liability offence where the owner can raise honest and reasonable mistake. This creates an asymmetry: the driver is absolutely liable, but the owner may have a defence. Forfeiture: Under s 4(6), if a person is convicted of an offence under s 4(3) or (5), the court may order forfeiture of the motor vehicle to the Crown if the notice referred to in the information for the offence was affixed within three months after another notice was affixed to the same vehicle. This is a discretionary power of the court, not automatic. It applies even if the owner is not the driver and even if the owner is a different person from the person convicted. Imprisonment for obstruction: A person who obstructs, hinders, assaults, or resists another person engaged in doing anything pursuant to the purported exercise of powers under s 5(1) or (3) is liable to imprisonment for a term not exceeding six months (s 5(5)). This is a serious indictable offence under force-based assault provisions. Proceedings: Offences are to be taken before the Local Court (s 9). There is no provision for infringement notices or on-the-spot fines; the matter must be prosecuted. Costs recovery: The Minister may recover costs and expenses as a debt due to the Crown in any court of competent jurisdiction (s 8). The certificate of the Commissioner is conclusive evidence of the amount certified, including any amount for which the Commissioner, authorised officer, or any person engaged is liable (e.g., due to negligence). This bypasses the usual requirement to prove the quantum of damages. Regulations: Breaches of the regulations may be punishable by a fine not exceeding five penalty units (s 10(2)(d)). The regulations may also take effect from a date before publication (retrospectively) but cannot impose liability for acts done before publication (s 10(3)).

Section 6 expressly provides that nothing in this Act affects the liability of any person for an offence under any other Act or any regulation, by-law or ordinance. This means that a driver who fails to move a vehicle could also be charged with a traffic offence under the Road Transport Act 2013, such as causing an obstruction under Rule 206 of the Road Rules 2014, or with a more serious offence such as dangerous driving if the circumstances warrant. The Act does not displace the ordinary law; it adds a special enforcement tool. The Act imports definitions from the Road Transport Act 2013 for "motor vehicle", "owner" (partially), and "public road". Changes to those definitions in the Road Transport Act will automatically flow into this Act unless the context otherwise requires. The definition of "public road" excludes roads or road related areas that are the subject of a declaration under s 18(1)(b) of the Road Transport Act 2013 relating to all provisions of that Act. This means that roads removed from the road transport regime (e.g., some private roads) are not subject to the obstruction powers, so other laws (e.g., the common law of nuisance or trespass) would apply. The Act's exculpation provisions in s 7 override any common law or statutory rights the vehicle owner might otherwise have for damages for trespass to goods, conversion, or negligence. The Crown and police cannot be sued for damage to the vehicle, even if caused negligently, unless regulations provide an exception. This ousts the ordinary tort remedies that would be available under the Civil Liability Act 2002. Similarly, the conclusive certificate provision in s 8 ousts the usual requirement for a court to assess quantum on evidence; it is a self-executing debt recovery mechanism. The Act also interacts with property law. Section 5(2) allows police to take possession of any land, private or public, without compensation (unless regulations provide it). This is a statutory right of entry that overrides the landowner's rights. It would not, however, authorise the police to demolish buildings or structures; it is limited to taking possession for the purpose of moving a vehicle. The Act's forfeiture provision under s 4(6) interacts with the Confiscation of Proceeds of Crime Act or the Fines Act, but the forfeiture here is specific to the vehicle obstructing. It would extinguish the owner's title and that of any secured party (such as a financier). However, because an unpaid vendor under a hire-purchase agreement is not within the definition of "owner", a financier may have difficulty claiming the vehicle after forfeiture. The Act also interacts with the Interpretation Act 1987. Section 10(3) permits regulations to take effect from a date earlier than publication, despite s 39 of the Interpretation Act, but such retrospective effect cannot cause a person to be guilty of an offence for an act or omission before publication. This allows the regulations to impose financial obligations retrospectively for seizure and impounding costs, but not criminal liability. The Act does not interact with the Charter of Human Rights because NSW has no statutory bill of rights, but the absolute liability offence and forfeiture without compensation may raise issues under international law that are not domestically enforceable.

The Act received assent in 1979 and commenced partially on that date (s 1 and s 2(1)), with the remainder to be proclaimed. It was amended by the Act No 144 of 1979 (shortly after enactment) which amended ss 3, 4, 5, and Schedule 1, likely to refine definitions or penalties. In 1987, the Interpretation Act amendment updated references (s 10). In 1989, s 2A was inserted by the Road Obstructions (Special Provisions) Amendment Act 1989 (Act No 89 of 1989, Sch 1). This was the crucial amendment that introduced the temporal limitation: the powers can only be exercised during a period declared by the Governor. In 1990, s 2A was substituted by the Road Obstructions (Special Provisions) Amendment Act 1990 (Act No 108 of 1990, Sch 1). This substitution refined the three-month period mechanism, allowing the Governor to declare periods up to three months, and requiring publication on the NSW legislation website (originally Gazette, later the website substituted in 2010). In 1992, penalty units were standardised (amendment by the Penalty Units Act 1992, No 112, Sch 1) to replace specific dollar amounts with penalty unit references. In 1997, the Traffic Legislation Amendment Act (No 115 of 1997, Sch 4.18) amended definitions (likely the definition of "owner" and "motor vehicle") and inserted a new s 11 (savings and transitional provisions) and Schedule 2. The same year, the Statute Law (Miscellaneous Provisions) Act (No 119 of 1997, Sch 2.22) made further definitional amendments. In 1998, the Crimes Legislation Amendment Act (No 99 of 1998, Sch 1.9) amended s 4, possibly to clarify the automatic disqualification period. In 1999, two omnibus statutes amended definitions (No 19, Sch 2.35; No 31, Sch 4.79, the later amending s 9 to replace references to the Local Court). In 2000, the Statute Law (Miscellaneous Provisions) Act (No 93 of 2000, Sch 2.43) updated Schedule 1. In 2005, the Road Transport (General) Act 2005 (No 11, Sch 3.31) updated references to road transport legislation. In 2007, the Courts and Crimes Legislation Amendment Act (No 94 of 2007, Sch 4) amended s 9 to update the Local Court reference. In 2010, the Statute Law (Miscellaneous Provisions) Act (No 119 of 2010, Sch 3.11) amended s 2A and s 10 to substitute references from the Gazette to the NSW legislation website, reflecting the shift to online publication. In 2013, the heavy amendment came with the Road Transport Act 2013 (No 19 of 2013, Sch 4.71), which replaced outdated references to the former Road Transport Act 2013 (the current Act) and updated definitions in ss 3 and 4. The Act has not been amended since 2013.

The source text does not record any specific litigation under this Act. Given the Act's highly unusual nature, it is likely to have generated very few proceedings. The Act's powers are only triggered by a Governor's order, and such orders are presumably rare (e.g., for major events, natural disasters, or short-term crisis situations). As a result, there is no judicial body of interpretation on key provisions such as the meaning of "forthwith", the standard for the opinion that a vehicle ought to be moved, or the scope of "practicable" for destruction. The absolute liability provision in s 4(7) has not been judicially considered in the text, but it would likely be upheld as a reasonable regulatory offence given the public safety objective, though it is unusual for a driving-related offence. The conclusive certificate provision in s 8 has not been tested on constitutional grounds (it may be challenged as ousting the jurisdiction of courts, but the High Court has historically upheld such provisions where the certificate is a precondition to recovery rather than a bar to review of jurisdictional error). The exculpation in s 7 has not been tested in tort litigation; a plaintiff might argue that the provision does not protect against damage caused without any purported exercise of power (e.g., if the vehicle was moved when no notice was affixed), or that the regulation-making power in s 10 might allow for a compensation scheme that would limit the exculpation. The forfeiture provision (s 4(6)) has likely been considered by Local Courts, but no reported appellate decisions are cited. The interaction between the Act and the Road Transport Act 2013 definitions might generate administrative law challenges if a road is incorrectly classified. The Act's operation during a declared period could be challenged if the order is not properly published or if the period exceeds three months. Overall, the Act is a dormant contingency law, so litigation is sparse. The principal risk of litigation would be for the Crown if it tries to enforce s 8 costs without proper compliance (e.g., if the owner was not the person defined as owner, or if the certificate was not properly signed). There is no recorded instance of a challenge to the constitutional validity of the Act under the Kable doctrine (personification of state power), but the involvement of executive detention of property without judicial process may be arguable.

Temporal limitation trap: The road obstruction powers can be exercised only during a period declared by the Governor under s 2A(2). A person who receives a notice must check whether an order is in force. If no order is in force, the notice is void, and the driver cannot be convicted under s 4(3) for failing to comply. However, the police may still rely on other laws. The Act does not require the notice to state that an order is in force, so a driver may not know. Absolute liability of driver: The driver's offence is absolute liability (s 4(7)). Honest and reasonable mistake is no defence. Even if the driver had no idea a notice was affixed (e.g., it was placed on a concealed part), the conviction stands. This is a trap for drivers who do not check their vehicle before driving. Owner liability without fault: Section 4(5) makes the owner guilty of an offence if an offence under s 4(3) is committed in relation to the vehicle. This does not require the owner to be involved in any way. The provision does not state it is absolute, but the default may be strict liability, leaving the owner to prove honest and reasonable mistake. Given the difficulty of that defence, owners face significant exposure for the actions of others who borrow their vehicle. Forfeiture without owner conviction: Under s 4(6), the court may order forfeiture of the vehicle if either the driver or the owner is convicted. An owner who was not the driver and who successfully defended the owner charge could still lose the vehicle if the driver is convicted and the three-month repeat notice condition is met. Destruction without notice: Police may destroy a vehicle if they consider it not practicable to move it (s 5(1)). There is no requirement to notify the owner or give an opportunity to move it before destruction. The owner's only remedy is through regulations, which may not exist. Section 7 exculpates the police even if the destruction was negligent. Costs certificate is conclusive: Section 8 makes the Commissioner's certificate conclusive evidence of the amount of costs and expenses, and of any liability of the Commissioner or officers. The owner cannot contest the quantum or reasonableness of the costs in debt proceedings. The only potential challenge is to the validity of the certificate itself (e.g., not signed by the Commissioner). Retrospective regulations: Section 10(3) allows regulations to take effect from a date before publication, provided they do not create offences for acts before that date. This means that financial liabilities (such as storage fees) can be imposed retrospectively on owners. Obstruction of "purported" exercise: The offence under s 5(5) for obstructing, hindering, assaulting, or resisting applies to the "purported exercise" of powers. Even if the police have no actual power (e.g., no order in force, or the vehicle is not on a public road), a person who physically obstructs the police can still be convicted. This gives the police significant protection from civil disobedience. Last driver definition: The duty to move the vehicle falls on the person who last drove it before the notice was affixed. If the vehicle has multiple last drivers (e.g., stolen, or left by a valet parking attendant), the identification may be uncertain, but the duty is strict. If the last driver cannot be identified, no person is liable for the s 4(3) offence, but the owner may still be liable under s 4(5). No requirement of reasonableness for directions: The notice directions are whatever the Commissioner or authorised officer "thinks fit" (s 4(1)). There is no express requirement that the directions be reasonable or practical. A direction to move the vehicle to a location that is unsafe or that is physically impossible might still create a duty to comply, and if compliance is impossible, the driver may still be convicted (absolute liability). However, administrative law principles would likely imply a reasonableness requirement, but that has not been tested.

For a driver who finds a notice affixed to the vehicle they last drove, the safest course is to read the directions carefully and move the vehicle immediately, exactly as directed, within the time specified. The driver must not do anything that would immobilise the vehicle (e.g., remove a wheel, disconnect the battery, engage a wheel clamp) until after the directions have been complied with. If the driver cannot move the vehicle (e.g., because it is broken down), they should take steps to have it towed or moved by a tow truck before the time expires. Failing to comply leads to an absolute liability offence and automatic disqualification. An owner who is not the driver should ensure that anyone who may drive the vehicle is aware of the Act and the potential consequences. If the owner becomes aware that a notice has been affixed, they should attempt to move the vehicle (even if they are not the last driver) to avoid escalation. However, the duty under s 4(2) is only on the last driver, so the owner cannot be guilty of failing to move it, but they can be guilty under s 4(5) if the driver offends. To avoid owner liability, the owner should ensure the vehicle is moved promptly by anyone capable. If the vehicle is impounded, the owner should contact the police to ascertain where it is being held and the process for release. The regulations may prescribe conditions, such as payment of costs. The owner should not attempt to obstruct the police or retrieve the vehicle by force, as that risks the s 5(5) imprisonment offence. If the police destroy the vehicle, the owner's only potential remedy is to seek compensation under any regulations that have been made. If the owner believes the police have acted without power (e.g., no Governor's order in force), they should seek urgent judicial review (a summons for judicial review or injunction) rather than self-help. For compliance by police and authorised officers: they must first ensure that a Governor's order under s 2A(2) is currently in force. They must form the opinion that the vehicle ought to be moved to prevent obstruction. They must affix the notice in the prescribed form (Schedule 1) to a conspicuous part of the vehicle. The directions in the notice should be clear and include a specific time for compliance. After the time expires, they may exercise the powers under s 5. Before destroying a vehicle, they should consider whether it is truly not practicable to move it. They should also keep a record of the opinion formed and the basis for the decision. The costs to be recovered under s 8 should be itemised and certified by the Commissioner. The certificate should be admissible in court. For persons engaged by police to move, modify, or destroy vehicles, they should confirm they are acting under the direction of the Commissioner or authorised officer. Section 7 protects them from liability for damage to the vehicle or loss of use, but the Act does not protect them from liability for personal injury or other property damage. For landowners whose land is taken possession of: there is no immediate remedy under the Act unless regulations provide for compensation. The owner should document the intrusion and seek legal advice about a possible claim for trespass if the police exceeded the power (e.g., by entering a building). However, s 5(2) grants broad authority.