TxDOT crews spent early Thursday morning cleaning up a spill of mud and rocks on the northbound Spur 408 bridge over Kiest Boulevard.
Police were called at about 1 a.m., after reports of a crash in the area. At least one car rolled over after hitting the mud on the bridge. The driver wasn't injured. Several other cars got flat tires.
Police said all three lanes were covered with a mixture of mud and large rocks.
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All lanes of Spur 408 were closed for several hours before opening back up around 9 a.m.