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The evening commute got off to a rocky start Monday on Highway 520 after a lane became covered with large rocks, blocking traffic.

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Traffic was backed up for about 5 miles following the incident while crews cleaned up the bumps in the road along westbound 520. The left lane was blocked for about an hour, started at around 5 p.m.

According to Washington State Trooper Rick Johnson, the driver of the vehicle that dropped the rocks will be cited. He tweeted that drivers need to secure their loads.

UPDATE: Crews are on scene to clear rocks from left lane of WB SR 520 just east of Montlake. Backup almost 5 miles. WB I-90 good alt route

— WSDOT Traffic (@wsdot_traffic)