The northbound lanes of a busy central Auckland road have reopened after they were closed by a serious crash.

A police spokeswoman confirmed a car and a motorbike collided on Ti Rakau Dr, Botany Downs, about 5.50am today.

One person was taken to hospital with serious injuries.

The northbound lanes were closed and diversions were in place at Pakuranga Highway [Waipuna Bridge] and Pakuranga Rd.

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Auckland Transport confirmed the lanes were reopened by about 8.20am.

The southbound lanes remained open.

Commuters were earlier urged to allow for extra time.

Meanwhile, a minor crash on State Highway 16 west of Waimauku was also causing delays for motorists.

Northern Fire and Emergency NZ shift manager Karen Larking said the crash, between McPike Rd and Woodhill Park Rd, was only minor but was likely to disrupt the journeys of those travelling to work.

Most other highways were free flowing but traffic was heavy in areas including SH1 north and southbound.