Fourth Street on-ramp westbound closed

The Fourth Street on-ramp to the westbound Interstate 10 in Ontario will be closed until about 8 a.m. because of a collision that resulted in an overturned semi tractor and trailer, according to the California Highway Patrol.
Dispatchers received the call about the collision from another motorist about 2:17 a.m., according to the Highway Patrol.
Emergency personnel need to off-load the trailer before it can be fully uprighted and removed from the roadway. No injuries were reported.