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In the United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
, Emergency Diversion Routes
are planned road traffic routes that bypass the main trunk road
A trunk road, trunk highway, or strategic road is a major road—usually connecting two or more cities, ports, airports, and other things.—which is the recommended route for long-distance and freight traffic...
Emergency Diversion routes provide the public with a pre-planned, checked and agreed junction to junction diversion route that circumnavigates an incident which has resulted in the closure of the main carriageway. Unfortunately, there are some locations where suitable diversion routes are not possible which then requires the Highways Agency and it’s partners to implement alternative tactics such as strategic signs and signals. These are managed by the National Traffic Control Centre (NTCC).
They are marked with road signs in the form of simple geometric shapes - open and filled circles, squares, and diamonds. Normally, these additions to roadsigns will be ignored by drivers.
When necessary, local road traffic authorities can put up signs at congestion points labeling these routes as traffic diversion routes, the emergency diversion route will guide you around the incident along an alternative road and bring you back onto the motorway or main road at a later junction.
The signs used for these routes can be found in the Transport Department publication "Know your Traffic Signs", page 107: http://www.ukmotorists.com/diversion_signs.asp