The most popular are:
1. Google maps. Great maps. However, the routes are not always the shortest. Doesn't show speed traps and petrol stations.
2. RAC route planner.
Not really my favourite.
3. Multimaps UK. Not really familiar with it but some friends highly recommend it.
3. The AA route planner. The best in my humble opinion. The directions are very detailed and very accurate. Shows locations of speed cameras and petrol stations. However, the maps are not very good. However, used with Google maps, it's just perfect.
Tags: uk route planner roads rac the AA multimaps google maps