They also offer UK route planning. My own London commute is estimated by Google at 9 minutes by road (Stamford Hill - Russell Square). Someone's comment on my own blog entry explains it well: Google assumes that several of you will cover the route simultaneously and that only the longest segment of the route needs to count. With a sufficient number of you covering the route, you should be able to complete the traversal of your commute in less than a second (and display some advertisements along the way)!