Christian Wolmar raises a very pertinent question, Why are roads favoured by the right and trains by socialists?:
... a whole host of right wing think tanks in the US lobby strongly for increased spending on roads, while simultaneously trying to kill off public transport systems, arguing they are inefficent and expensive. (...)
What is it about roads that attracts the Right? Surely they must, by now, realise that the freedom afforded by the car is illusory, since, as usage rises, the extra societal costs of more people getting on to the road outweigh by far the benefits. And the simplistic view that roadbuilding is the answer has been widely discredited. There is a gaping intellectual gap in the Right's thinking which environmentalists and public transport supporters should be more adept at exploiting.