Taxi drivers among those impeded by the LTNs.

• IF Andrew Willet (Taxis are neither emergency services nor the drivers experts, March 25) does not speak to taxi drivers he will not be aware of how they are used in emergencies.

Besides taxis some emergencies call for plumbers, electricians, gas engineers and other services besides ambulances or the police or the fire brigade. They are all impeded by the LTNs.

PATRICK CARROLL
Canonbury Road, N1