Southbound lanes of Highway 99 reopen after being blocked by overturned 18-wheeler at West Road

HOUSTON, Texas (KTRK) -- All southbound lanes of Highway 99 have reopened after being blocked by an overturned 18-wheeler at West Road on Thursday morning.

Houston TranStar verified the hazmat spill at 4:38 a.m. Traffic cameras showed an 18-wheeler on its side when crews were working to clear the scene.

The roadway was reopened just before 9:30 a.m., and it's unclear what led to the crash.

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