A motorcyclist is in serious condition after crashing while fleeing from police in Lower Hutt last night.

Police observed the motorist riding in a dangerous manner on Fairway Dr before they turned onto Taita Dr about 10.30pm, said Hutt Valley Area Commander Inspector Wade Jennings.

The motorcyclist allegedly accelerated and overtook another vehicle before they failed to turn a corner and crashed into a fence, said Jennings.

The incident occurred before police signalled the rider to stop, he said.

They suffered serious leg injuries and were taken to hospital.

The Serious Crash Unit examined the scene, and inquiries into the circumstances of the accident remain ongoing.