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Lower speeds make higher emissions


Lewis Lesley argues that bypasses and better designed roads cannot be justified because they result in increased traffic and emissions.

Having been familiar with the A34 route through Newbury before the bypass opened, I would query whether traffic travelling at low speeds on the former route through the town would not have produced more emissions than the same volume of traffic travelling at 70mph on the bypass.

I know that my car uses significantly more fuel in stop/ start slow traffic conditions and thus must produce more emissions per mile than it does at a steady higher speed.

But emissions cannot be the sole factor to be considered in justifying new bypasses. The effect of the pollution that existing traffic causes to residents has to be considered.

I do agree, however, with Lewis Lesley, in that if we were to have a cycle network such as in Holland I would be tempted to use a bicycle for many trips for which I now use my car. But there is no way that I could be tempted to do so on most existing roads.

John Judge (M), Trowbridge Wilts. john. judge@lineone. net

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