Why is the Driving Standards Agency testing British drivers on questions that have no relevance to the UK? With the help of a Telegraph reader, Peter Hall reports.
John Whitmore puts the case for the Greater London Authority's environmental transport policies.
Austin Williams responds to Ken Livingstone's objections to a reader's letter about London's Low Emissions Zone.
Pat Devereux drives the Honda FCX Clarity, while Andrew English wonders why Californians seem to get all the best green tech.
Peter Hall addresses criticism of last week's article about offical road safety policy.
