A crash involving two big rigs and a third vehicle blocked the westbound lanes of Highway 580 in Pleasanton early Friday, according to the California Highway Patrol.
The crash was reported shortly before 9 a.m. near the Hopyard Road exit, CHP Officer Peter Van Eckhardt said.
One of the big-rigs overturned and its fuel tank ruptured, spilling between 75 to 100 gallons of diesel fuel onto the roadway, Van Eckhardt said.
Ambulances responded to the scene, but Van Eckhardt did not immediately have information about possible injuries caused by the crash.
Caltrans crews were also en route to clean up the fuel spill, according to Van Eckhardt.
He said the far right westbound lane remains open but the other lanes of the highway will likely be closed through the late morning hours.
Van Eckhardt said traffic will be backed up since “alternate routes out there are very hard to come by,” with motorists only able to take surface streets around the scene of the crash.