Derek Jones' letter (NCE last week) points out that road investment does not match the tax take from motorists.
This is correct, but is only part of the story. If the other costs which motoring imposes on society - primarily congestion, accidents, pollution and noise - are also included, a different picture emerges.
Research (ITS University of Leeds 1998) suggests that the marginal costs of motoring are between two and three times the current tax take.
Civil engineers should join the debate on transport investment, but we should ensure the full facts inform our deliberation.
Andy Braithwaite (M), secretary to the Commission for Integrated Transport, First Floor, Ashdown House, 123 Victoria Street, London SW1E 6DE