Driver location signs were introduced in 2003 and are designed to be read at speed. They all look alike, whether they are on a motorway or an A road. They have yellow lettering on a blue background with a white border.
How to recognise a driver location sign:
The information is shown in three rows:
• the first row shows the number of the motorway or A road
• the centre row shows the direction of travel (for example, on the M25, clockwise is shown as 'A', while anti-clockwise is shown as 'B')
• the last row shows the distance, accurate to within 20 metres, from the assumed start point of the motorway or A road
The information on the signs will be useful if you need to report:
• your location during a breakdown
• a road traffic incident
• debris on the road
For more information on driver location signs see here.