Aren traffic signs supposed to be in imperial units, not metric?
For more than 30 years, distance marker posts have been provided at 100 metre intervals along each hard shoulder of motorways. These are used for maintenance purposes (e.g. to enable maintenance contractors to identify exactly where repair works are needed). Also, they show the direction to the nearest motorway emergency phone. When a driver uses one of the motorway emergency telephones, the RCC operator knows the precise location of the caller. However, with the increased use of mobile telephones by drivers in an emergency, police may not be able to quickly locate the scene of an incident, as drivers sometimes are not sure of their location. Also, on many all purpose roads, there are no emergency telephones. Therefore, at a number of trial sites, both on motorways and on all purpose roads, driver location signs have been erected by the Highways Agency at regular intervals (e.g. every 500 metres in each direction). These traffic signs use the same motorway referencing system as the dis
