A Traffic Regulation Order (TRO) is a legal document made under the Road Traffic Regulation Act 1984, the Traffic Management Act 2004 and all other enabling powers, by the local authorities under its powers as a highway authority and are designed to regulate, restrict or prohibit the use of highway or any part of the width of highway by vehicular traffic or pedestrians.
They involve a legal procedure that requires, for example, the displaying of a public notice in local newspapers to ensure that the local people affected are given the opportunity to object to the proposals. Examples of TROs include double or single yellow lines, loading bays, one-way streets and speed limits.