The crash involved more than one truck and happened just before 10 a.m. on Route 9 at CR 520/Robertsville Road in Marlboro.
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Marlboro Mayor Jonathan Hornik said roughly 3,000 gallons of fuel leaked onto the roadway, with the cleanup lasting through the start of the evening commute.
Route 9 was closed between Union Hill and Texas Road until further notice, and even though detours were in place, traffic was backed up for miles.
Police, firefighters, HazMat crews and the state Department of Transportation are on the scene.
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Some local businesses were evacuated as a precaution, and drivers were urged to avoid the area.
Hornik said he expected Route 9 to be shut down at least through the early evening as crews work to clean up the road.
The driver of the leaking tanker truck was hurt in the crash and was taken to an area hospital to be treated for non-life threatening injuries.
The cause of the crash is under investigation.
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