Sir - I was fascinated to read in Keith Mitchell's letter about proposed eco-towns (February 29), that tramways are viable in towns of far less than 15,000 homes.

How much greater would be the benefit to us and to the environment if Oxford and its satellite towns, with perhaps ten times the number of homes, were served by tramways.

We know that making existing towns more eco-friendly is difficult, but here is one method that could provide Oxford with real gains.

I was puzzled by his insistence that a car is needed for families to carry their weekly shopping home. Many supermarkets already offer this service, and during the last war, when petrol, let alone cars, were but a gleam in most consumers' eyes, delivery by bicycle was very efficient.

Andrew M. Pritchard, North Hinksey