At least two dozen people were injured.
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Montgomery County Fire & Rescue Service spokesman Pete Piringer tweeted that drivers couldn't avoid running into the debris as they commuted toward Washington, D.C., at about 5:20 a.m.
All lanes were closed as many units responded, taking people to hospitals, some with severe injuries.
Police rerouted cars but the morning commute bogged down, with the Metropolitan Area Transportation Operations Coordination reporting delays five-miles long.
I-270 South was shut down for more than two hours as police, firefighters and medics responded to the scene and crews worked to clear the wreckage.
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The Associated Press contributed to this report.
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