Bus and taxi firms were split on the Norwich City Council proposals to fine drivers who leave their engine to idle.

Colin McAulay, manager of Norwich Airport Taxi Association said: “Some black cabs are basically refrigerators in bad weather. You couldn’t keep working without the engine running, especially older drivers.

“Why should we be fined for a money making scheme?”

Steve Wickers, Managing Director for First Eastern Counties said: “We work closely with Norfolk County and City Councils to initiate improvements in air quality and the local environment, and would welcome further discussion on how this scheme would work if it is launched.

“There is a major problem with congestion and emission levels in the city, especially at peak times, and cars are the main contributor to the situation.

“Buses can help provide the answer to both congestion and air quality.”