The 46-year-old man is in stable condition after being shot two to three times in the torso just after midnight.
It was near the 210-57 split where CHP closed down the freeway Wednesday morning. A helicopter landed on the eastbound lanes to airlift the shooting victim to County-USC Medical Center.
Azusa police say the motorist was driving in a white pickup truck between the Irwindale and Grand Ave. exits when a compact car pulled along side him and started shooting.
"And as he's traveling eastbound at some point a vehicle opened fired on his car, striking his car several times on the passenger-side door," said Lt. Paul Dennis, Azusa Police Department. "The vehicle was struck several times and our victim was hit a couple of times as well."
He continued to drive with multiple gunshot wounds, not stopping for help for several miles.
It was finally at the 57 interchange in San Dimas where the victim pulled over for assistance. Caltrans workers spotted the man and called police.
"When he pulled off the freeway there was some Caltrans workers out doing some road work on the freeway at the time and they did come to his assistance and they helped him contact the police," said Dennis. "So, you know, the citizenship of Caltrans workers is much appreciated."
The victim's pickup truck is now in the custody of Azusa police as they continue their investigation.
Authorities don't know why the man was targeted. They admit their investigation is compounded by the fact that the shooting happened in the middle of the night, with few motorists on the road to witness what happened and who was involved.
At this point authorities are asking for the public's help. Anyone with any information regarding the shooting is asked to call the Azusa police at (626) 812-3200.
The shooter or shooters have not been identified. Police are still looking for a motive in the case.