Four people have had a lucky escape after the car they were in drove off a bluff on the Christchurch Port Hills overnight.

A police spokesman said the car went off Summit Rd nears Gebbies Pass summit and plunged down a steep bank just before 11pm.

"The vehicle was driven off the side of the road and travelled a short distance down a bluff," he said.

There were four people in the vehicle when the accident happened.

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Those inside managed to scramble to safety to the road, he said.

The driver and passengers escaped with only minor injuries.