Letter: Don't leave the engine running

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Sir: W A White complains about pollution caused by drivers leaving diesel engines running while making deliveries. As a regular user of level- crossings, I am constantly surprised by the number of drivers who leave their engines running while waiting (often for some time) for trains to cross.

Is there any reason why every level-crossing sign should not include the words "Please switch off engine while waiting"?


Egham, Surrey