Police are intending to crack down on a planned boy racer event in Hawke's Bay this weekend

They say a number of cars are expected to take part - with concern spectators could inadvertently be hit by one of them.

Inspector Angela Hallett is asking witnesses of antisocial behaviour to contact them to help the police response.

She says police have already completed enquires with suspected participants - with many parents now more aware of their teenagers' weekend activities.

Hallett says officers are focusing on skids and burnouts - which cause significant, and costly, damage.