The incident happened just before 2 p.m. Friday afternoon.
The CHP told ABC7 News that a car boxed in a silver Hyundai sedan. The occupants got out and robbed the victim inside the car and that the suspects were armed. After taking the victim's belongings, the suspects sped off.
The highway is said to reopen around 6 p.m.
The CHP says, fortunately, no one was hurt in the brazen armed robbery.
Stay with ABC7 News for more on this developing story.