What is a Traffic Regulation Order?

The legal instrument behind most overnight parking bans. What a TRO is, how to read one, how to find the one that applies to a car park, and what happens if you breach it.

A Traffic Regulation Order — a TRO — is the legal document a council makes to control how a road or car park may be used. It is the instrument behind most overnight parking bans.

If a sign says you may not stay overnight, a TRO is usually why. It has a reference number, it was consulted on, it is published, and you can read it.

Where it comes from

TROs are made under the Road Traffic Regulation Act 1984 by a traffic authority — your county or unitary council for most roads, National Highways for the strategic network, Transport for London in London.

They cover the ordinary furniture of driving: waiting restrictions, loading bays, one-way streets, weight and height limits, residents' parking, and the rules of council car parks — including whether you may be there overnight.

The three kinds

Permanent. The normal sort. Consulted on, advertised, and in force until varied or revoked.

Experimental. Made for up to 18 months to try something out. Objections can be made during the first six months. Councils often use these for new motorhome restrictions, which means the position can change — a spot that was fine last summer may be under an experimental order this one.

Temporary. For roadworks, events and emergencies. Up to 18 months for roadworks, shorter for events.

How to read one

A TRO is a legal document, so it reads like one. The parts that matter to you:

• The schedule. Where the actual restriction lives — usually a list of roads or car parks with the specific prohibition against each. Read the schedule, not the preamble.
• The defined hours. "No waiting between 2300 and 0700" is a very different restriction from "no waiting at any time".
• The vehicle classes. Some orders restrict by weight, height or vehicle type. An order aimed at HGVs may or may not catch a 3.5-tonne motorhome, and the wording decides it.
• The exemptions. Most orders exempt loading, blue badge holders, emergency services and sometimes residents.

The phrasing you are looking for is usually along the lines of "no person shall cause or permit a vehicle to remain" between certain hours. That is an overnight ban, written in 1984 language.

How to find the one that applies

On the sign. Many signs carry the order reference. That is the fastest route.

On the council's website. Traffic authorities publish their orders, though the quality of that publication varies enormously between authorities.

Nationally. The Department for Transport now runs a central digital service for Traffic Regulation Orders, with traffic authorities publishing to it and the data made freely available through an API. That is a genuine change: orders that were scattered across hundreds of council websites in hundreds of formats are becoming a single queryable source.

This is why we can name the order. Where we mark a stop as overnight prohibited, we can cite the instrument behind it rather than saying "we heard it is not allowed". Where nobody has published anything, we say that instead.

What happens if you breach one

Usually a Penalty Charge Notice under civil enforcement — the same mechanism as any parking ticket. Amounts vary by authority and by band, typically reduced for early payment.

Some restrictions on the public highway are enforced by the police rather than the council, in which case a fixed penalty applies instead.

You can challenge a PCN. If the order is defective, badly signed, or does not actually say what the council thinks it says, that is a genuine ground — signage and the order have to match.

The two things people get wrong

"There was no sign." A TRO generally has to be properly signed to be enforceable, so this is sometimes a real defence. But "I did not see the sign" and "there was no sign" are different arguments, and photographs at the time are worth far more than a memory later.

"It has been like that for years." Orders are varied and replaced constantly, and experimental orders appear with little fanfare. Age tells you nothing about the current position.

In one line

A TRO is the law behind the sign — it has a number, it is public, and if a stop is prohibited there is a document that says so.

Last reviewed 21 August 2026. General guidance, not legal advice. If you are challenging a penalty, the order and the signage at the time are what matter.

Sources: Road Traffic Regulation Act 1984 · Traffic Signs Regulations and General Directions · DfT Digital Traffic Regulation Orders service.