Arthur C. Clarke Quote

… we have a situation in which millions of vehicles, each a miracle of often unnecssary complication, are hurtling in all directions under the impulse of anything up to 200 horsepower. Many of them are the size of small houses and contain a couple of tons of sophisticated alloys — yet often carry a single passenger. They can travel at a hundred miles an hour, but are lucky if they average forty. In one lifetime they have consumed more irreplaceable fuel than has been used in the whole previous history of mankind. The roads to support them, inadequate though they are, cost as much as a small war; the analogy is a good one, for the casualties are on the same scale.

Chapter 3 (The Future of Transport) in Profiles of the Future (7th printing, 1972)