I’ve seen Driver Location Signs on the M25 and the M6, the signs are of different sizes. Why is this?
The size of the legend on driver location signs depends upon the number of lanes on the route. The larger legend signs are used where the road is a 4 lane motorway or dual carriageway, to ensure readability by road users. Some of the trial sites are 3 lane motorways, some are 4 lane motorways. As the M25 in many places is 4 lane carriageway in each direction, it was considered that one of the larger legend sizes would be most appropriate for the M25.
