This footage shows a shocking moment when a semi truck nearly rolled over on a runaway ramp. The incident occurred on Interstate 5 along the California Grapevine.

Caltrans HQ posted this video on their Facebook page on May 25th. The video was intended to show viewers the reason why runway ramps exist.

“If you’ve ever driven through hilly or mountainous terrain you’ve surely seen runaway truck ramps leading away from the road. If you’ve ever been curious why and when they’re needed, here’s the answer,” they wrote on Facebook.

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