California Highway Patrol is on the scene of an accident on westbound Highway 180 near the Fulton Street offramp in Fresno.
A small truck hit a small big rig around 2 p.m. on Wednesday. It is not known which driver was pinned in.
The damage from the crash has kept one driver from exiting his vehicle.
The driver does not seem to be injured and was able to call a tow truck to the scene from his vehicle, a CHP spokesman said. There appear to be no injuries.
The roadway was partially closed while emergency crews responded, the CHP said.