The motorist who knocked down four cyclists on Auckland's Tamaki Drive has pleaded guilty to four charges of careless driving.

Aucklander Martin Feeney normally cycles 8km to work each day.

A driver will face charges after a group of cyclists were struck by a car on Auckland's waterfront a month ago.

If New Zealanders increased their cycling to the modest levels of the 1980s, they would burn off annually the amount of energy in 40 million cans of Coke.