Santa Rosa police Monday still were attempting to learn what happened to a man found lying unconscious Friday night on a westside roadway.

He'd suffered a life-threatening head injury and was still hospitalized Monday, Santa Rosa Sgt. Dave Linscomb said.

Linscomb wouldn't release the man's name, saying it remained unclear whether he was assaulted or a victim of a traffic collision.

"Not until we find out more about what this is about," he said.

The man, described as being in his 60s, was found at about 9 p.m. Friday. He was lying partially in Peterson Lane near Guerneville Road.

He lives in the area and officers were told he was probably walking to a nearby store as part of his regular routine.

Linscomb said the man hadn't been gone from home long before he was found.

Police have reported a white car occupied by two males was seen in the area at the time of the incident. The car reportedly had a loud exhaust system.

It is unknown whether the car is connected to the injured man, but police were hoping to find the car and the driver and passenger.

Detectives hadn't been able to speak to the victim due to his injuries.

"It's a real strange situation. There's not a whole lot to go on," he said.

Police officials asked anyone with information to call detectives at 543-3600.

You can reach Staff Writer Randi Rossmann at 521-5412 or