My Society has produced some nice travel time maps for Great Britain that you can see here. I particularly like this one comparing travel time by car and train from Cambridge. The red areas are quicker by train, orange is about the same and then yellow to green to blue gets gradually faster by car.
A couple of disclaimers about this map from their site:
"the road travel model takes no account of traffic or urban areas, so it is pessimistic about the time saving"
"However, the model of car journey times is very simplistic, so these results should not be taken too seriously—we hope to extend the work with a more realistic model of driving times, which may substantially change the comparative results."
2 years ago