BRENTWOOD -- Three people were injured, and one man was arrested on suspicion of drunken driving after five cars were involved in a wreck Saturday morning, a California Highway Patrol officer said.

The five-car crash happened at 10 a.m. on Saturday in the southbound lanes of Balfour Road at Bypass Road, CHP Officer John Fransen said. An initial investigation indicated the driver of a black Chrysler hit a concrete strip that separates the southbound and northbound lanes while trying to turn right onto Highway 4, Fransen said.

"It appears he was going too fast," Fransen said.

The driver of the Chrysler lost control of the car after hitting the barrier, and collided with four other vehicles. Three people in those cars were taken by ambulance to a hospital, where they were treated for injuries that weren't life-threatening, Fransen said.

Witnesses to the wreck told police that the wreck may have been triggered by a road-rage incident, Fransen said. According to witnesses, the driver of the Chrysler may have made an obscene gesture at another driver shortly before losing control, Fransen said.

Police did not identify the driver.

Rick Hurd covers public safety. Contact him in Antioch at 925-779-7166 and follow him at Twitter.com/3rdERH.