A driver called 911 Tuesday morning after he had been shot on a highway in Oakland.

Around 6:30 a.m., the California Highway Patrol got a call from an Oakley man who was on his way to work and was suffering from a gunshot wound to the calf just west of the Caldecott Tunnel.

"He didn’t recognize the driver, he didn’t notice the driver in the car, he just heard four to five pops," CHP officer Herman Baza said. "He felt the impact, he heard the glass shatter in his vehicle."

CHP investigators are still trying to find a better description of the suspect’s car, as well as a motive. Beza advises drivers to stay calm when dealing with violent motorist.

"Always avoid road rage, it’s not worth it, you never know who you’re dealing with out there," Beza said.

This has been the fourth shooting to occur on a highway or interstate in Oakland this year, the CHP said.

The man was taken to a hospital with gunshot wounds that are not considered life-threatening, Baza said.

Baza did not know exactly where the shooting took place and said officers were in the area to look for evidence. Lanes were briefly blocked during the search for evidence, but the highway has since fully reopened, according to the CHP.

No suspect information was immediately available in connection with the shooting, Baza said.