"A person is guilty of an offence if he intentionally and without lawful authority or reasonable cause— (a) causes anything to be on or over a road, or (b) interferes with a motor vehicle, trailer or cycle, or (c) interferes (directly or indirectly) with traffic equipment in such circumstances that it would be obvious to a reasonable person that to do so would be dangerous."
"3.2. The government accepts the need to create in England and Wales a new criminal offence of intentionally obstructing a road or interfering with devices for the regulation of traffic. The new legislation will be a modified version of the offence proposed by the Criminal Law Revision Committee 14th Report, Offences Against the Person 1980. It will not affect people who are for example taking part in street demonstrations. The elements of the offence will be designed to catch the person who was or ought to have been aware that personal injury or damage to property might be caused by his actions and unlawfully and intentionally places an obstruction on the road, interferes with any signs or equipment for traffic regulations or interferes with any conveyance intended for use on the road... 3.3. The scope of the offence will be limited to those areas to which the proposed new major offences will apply. It will be triable either summarily or on indictment and the proposed maximum penalty on indictment will be seven years' imprisonment as recommended by the Criminal Law Revision Committee. This marks the potentially greater culpability of a deliberate act which may put many lives at risk."
"Whosoever shall unlawfully and maliciously put or throw upon or across any railway any wood, stone, or other matter or thing, or shall unlawfully and maliciously take up, remove, or displace any rail, sleeper, or other matter or thing belonging to any railway, or shall unlawfully and maliciously turn, move, or divert any points or other machinery belonging to any railway, or shall unlawfully and maliciously make or show, hide or remove, any signal or light upon or near to any railway, or shall unlawfully and maliciously do or cause to be done any other matter or thing, with intent, in any of the cases aforesaid, to endanger the safety of any person travelling or being upon such railway, shall be guilty of [an offence]. "
"Whosoever shall unlawfully and maliciously throw, or cause to fall or strike, at, against, into, or upon any engine, tender, carriage, or truck used upon any railway, any wood, stone, or other matter or thing, with intent to injure or endanger the safety of any person being in or upon such engine, tender, carriage, or truck, or in or upon any other engine, tender, carriage, or truck of any train of which such first-mentioned engine, tender, carriage, or truck shall form part, shall be guilty of [an offence]."
"193. Sections 32 and 33 are narrowly defined in that they require an intent to endanger the safety of persons upon the railway ... 195. The sections require modernisation and simplification and in our opinion they should not be limited to an intention to endanger the safety of users. It should be an offence if the act is intentional and the defendant is negligent as to causing personal injury or damage to property. The offences were created at a time when the railway was the only form of fast transport. There are now other forms of fast transport. The same kinds of conduct requiring criminal sanctions can occur in respect of the other forms of transport as well as railways, for example the deliberate obstruction of the highway by throwing lumps of concrete onto it or interference with airport safety equipment. We therefore consider that the type of conduct at present penalised by sections 32 and 33 shall be extended to conduct which endangers both road and air traffic as well as railways so that dangerous conduct affecting these forms of transport also is made a specific offence. 196. In our opinion the maximum penalty for the proposed event shall be seven years' imprisonment. It will be an offence which can be either very serious or comparatively trivial. In these circumstances we recommend that it should be triable either way."