Traffic regulation orders

Page updated on: 07/09/2023

Traffic regulation orders (TROs) are legal agreements which allow us or the police to enforce regulations including:

  • Double yellow lines, speed limits, on-street parking, one-way streets, traffic calming and car parks.

Most TROs are created with input from local communities and the police, to address specific traffic congestion or quality of life issues.

There is a statutory procedure for creating a TRO.

Design and consultation

We create a proposed design for the TRO and then consult on this with local councillors and parish councils, the emergency services and sometimes other institutions such as The Freight Transport Association, The Road Haulage Association and local public transport operators. Local residents, traders and community groups who are likely to be affected are consulted where appropriate. Following consultation, the proposal may be amended.

Advertising the TRO

We will usually display a notice in the local paper and put signs in affected roads. We may also deliver notices to premises likely to be affected. For at least 21 days from the start of the notice the proposal can be viewed online and at a nominated council office. Objections and comments must be made online or by writing to the address in the notice. Objections and contentious issues are considered by local councillors who decide whether to allow the scheme to proceed as advertised, modify the scheme or abandon it.

Making the Order

The TRO is formally made and introduced.

This process can take many months and be very costly. This means that schemes which need a TRO are usually planned and included in the annual Capital Programme.

A Proposed Traffic Regulation Order or Proposed TRO gives members of public notice that the Authority wishes to implement a Traffic Regulation Order, giving them time to send in any objections to the proposal. You can view a list of proposed traffic orders on the public notices section of our website.

View public notices


An experimental order is like a permanent traffic regulation order in that it is a legal document which imposes traffic and parking restrictions such as road closures, controlled parking and other parking regulations indicated by double or single yellow line etc. The experimental traffic order can also be used to change the way existing restrictions function. An experimental traffic order is made under Sections 9 and 10 of the Road Traffic Regulation Act 1984 An experimental order can only stay in force for a maximum of 18 months while the effects are monitored and assessed.

Changes can be made during the first six months of the experimental period to any of the restrictions (except charges) if necessary, before the Council decides whether or not to continue with the changes brought in by the experimental order on a permanent basis.

You can view a list of experimental traffic orders on the public notices section of our website.

View public notices

To object or comment on a proposed traffic regulation order, contact us by emailing Please include order title, order number and your full name and address.

It is not possible to lodge a formal objection to an experimental traffic regulation order until it is in force. Once it is in force, objections may be made to the order being made permanent and these must be made within six months of the day that the experimental order comes into force. If feedback or an objection is received during the period that suggests an immediate change to the experiment that change can be made and the experiment can then proceed. If the experimental order is changed, then objections may be made within six months of the day that the experimental order is changed.

Traffic orders are legal agreements which allow us or the police to enforce regulations including speed limits, on-street parking and one way streets. On-street regulation orders cover on street parking, stopping and waiting restrictions.

If you need the details of a current TRO, you can request it by emailing

All parking restrictions in Carmarthenshire are consolidated into a single traffic regulation order for the entire county. Changes to this consolidation order are made through amendment orders. These amendment orders can change the legal definitions of the restrictions (the articles) or the location descriptions (the schedules).