Westbound lanes of Interstate 10 at the West Loop are expected to stay closed through rush hour after a hazmat spill shut down the highway Tuesday morning. The Texas Department of Transportation is urging commuters to find a way home that avoids the area.

An 18-wheeler carrying sulfuric acid crashed on Interstate 10 near North Post Oak before 8 a.m. Tuesday, spilling a portion of its load, said Danny Perez, a TxDOT spokesman.

Only about a gallon of the acid spilled onto the highway, but the load shifted in the truck and must be offloaded by a hazmat crew, Perez said.

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The highway will be shut down at the busy Interstate 10-Loop 610 interchange until rush hour, TxDOT predicted at 2 p.m.

"It will be multiple hours" before the westbound lanes are open again, Perez said Tuesday morning. At about 2 p.m., more than six hours after the crash, Houston Transtar cameras showed Interstate 10's westbound traffic backed up to Shepherd from North Post Oak, where the spill occurred.