Also Joan Smith (23 November) asserts that "today's bigger, faster cars are choking us to death". Today's cars are relatively clean, what with the use of unleaded fuel, electronic engine management and catalytic converters. It's not today's bigger, faster cars that are the problem in London, but the sheer number of cars - particularly older ones and diesels - sitting idly in jams caused by a mixture of inadequate roads and underfunded public transport. By the way, cars and speed per se don't kill people: bad driving and simple errors do.
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