BOYLE HEIGHTS (CBSLA.com) — A major freeway transition road that runs through Boyle Heights was shut down Monday night after a big rig towing a cement mixer overturned.

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Los Angeles fire crews and the California Highway Patrol responded to the crash shortly before 8 p.m.

The accident completely blocked the roadway, which forced the closure of the southbound 5 Freeway to the eastbound 10 Freeway transition road. Traffic was backed up for miles.

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The driver of the tow truck was not injured.

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The CHP is investigating the collision.