Access to the Splore Festival along the Clevedon-Kawakawa Road is blocked after a car crashed and toppled a power pole.

Powerlines have also fallen across the road and blocked it to traffic.

Police said there were no serious injuries in the crash, but it would be a couple of hours before the road was cleared.

Festival goers will need to travel via Miranda, south of the festival, until the road is opened again around 1pm.

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There will also be significant delays for those heading to the NZ Polo open in Papakura as a result of heavy traffic in the area.

Police urged motorists to allow for extra time, "drive with patience and slow down".