LAFAYETTE (CBS SF) — An Acura sedan slammed into a big rig on eastbound Highway 24 early Wednesday, shutting down several lanes during the morning commute, backing up traffic for miles for several hours.

According to the California Highway Patrol, the crash was first reported around 6:48 a.m. on the busy freeway near Pleasant Hill Road.

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The sedan reportedly crashed into the big rig as it was stopped on the freeway. The collision shut down lanes 3, 4, 5 and 6.

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An injury was also reported. A SigAlert was issued as commuters clogged other routes toward Walnut Creek, slowing the commute across the East Bay.

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The CHP reported all lanes were reopened at 9 a.m.