Thousands of motorists were Saturday night stranded along the Nairobi - Mombasa highway following a massive traffic jam that extended about twenty kilometers on the stretch before Athi River.

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Many motorists spend as much as eight hours in the traffic jam while some spent the night on the road.

The traffic jam is yet to be cleared and motorists are still stranded

Machakos County Commissioner Matilda Sakwa said an accident that happened at Primarosa caused heavy traffic snarl up on Mombasa road.

The accident involved a trailer and a pickup. The pickup driver died on the spot.

"Traffic police officers are on the ground working on easing the congestion," Sakwa said.