The fire, which was reported around 11:40 a.m., has burned 30 acres, Cal Fire said, but no structures have been damaged.
A Sig-alert for eastbound Highway 80 was issued around noon as the blaze, which CHP Officer Marc Johnston said was caused by a vehicle fire, had shut down the No. 3 lane on the highway.
All lanes were cleared at 12:21 p.m. and the Sig-alert was canceled three minutes later, the CHP reported.
