Sir - I can't imagine why we should take advice on motoring topics from a man who by his own admission (in his Sunday Times column a few months ago), had great difficulty changing lanes on motorways in the United States (Clarkson 'will be killed' if limit on A44 is not raised, December 1).

I have driven extensively across eight American states, from California to Illinois, and have never had the slightest difficulty doing so - including on the very complex system of motorways and interchanges around San Francisco international airport.

John Kinory, Steeple Aston