A tractor trailer and a truck collided on the southbound 15 Freeway south of Fourth Street. The CHP received a report that the semi possibly jackknifed, blocking several lanes.

Two vehicles collided on the transition road from the westbound 10 Freeway to the southbound 57 Freeway in Pomona. The vehicles were moved to the right shoulder and there were no reported injuries. Traffic backed up to about Towne Avenue.

A blue Toyota Camry and a second vehicle collided on the northbound 15 Freeway at the 215 Freeway interchange, blocking the fast lane.

Two vehicles struck the center divider on the eastbound 60 Freeway at Grand Avenue, blocking the carpool lane. There were no reported injuries.

A crash involving a white pickup truck, a silver Chevy Malibu and a third vehicle occurred on the westbound 10 Freeway on the Sierra Avenue off-ramp, blocking a lane. A motorist reported the driver of the Chevy appeared to be injured.

The CHP issued a traffic advisory dur to heavy fog on the 15 Freeway at the 210 Freeway interchange. The fog has decreased visibility to about 100 feet.

A white Kia Rio broke down on the westbound 60 Freeway east of Phillips Ranch Road. A hit and run driver struck the vehicle and continued driving west. A woman who was in the vehicle was not injured.

A tractor trailer overturned on the northbound 15 Freeway while swerving to avoid a stalled vehicle, prompting a Sig Alert in the Cajon Pass.The crash was reported at 4:56 a.m. on the northbound 15 near Cleghorn Fire Road. The semi lost control while trying to avoid a car that was stopped in the slow lane. The crash severed the semi's fuel tank, which spilled 20 to 35 gallons of fuel on the roadway. All northbound lanes were blocked and the CHP issued a Sig Alert for an unknown duration. At 6:04 a.m., officers reopened the slow lane and right shoulder.

A silver vehicle struck the center divider on the westbound 210 Freeway west of Waterman Avenue, blocking the fast lane at 1:44 p.m.

A vehicle crashed into the back of a semi truck on the southbound 15 Freeway near Hodge Road. Paramedics came to the scene of the crash to help a motorist who complained of pain.

A tractor trailer and a maroon Ford Taurus collided on the eastbound 210 Freeway east of Mountain Avenue. The Ford stopped along the center divider and the semi was on the right shoulder. There were no reported injuries.

A vehicle caught on fire on the southbound 71 Freeway south of Euclid Avenue, igniting a hillside. The CHP issued a traffic advisory due to blocked lanes.

The CHP closed the Reservoir Street and Diamond Bar Boulevard on-ramps to the eastbound 60 Freeway, as well as two lanes of the eastbound 60 east of Diamond Bar Boulevard due to about eight brush fires burning near Diamond Ranch High School. The third-alarm fire incident was reported at 11:45 a.m.

A white Ford pickup truck, a red Dodge Charger and a red pickup truck collided on the westbound 60 Freeway east of Haven Avenue. All vehicles stopped on the right shoulder.

A pickup truck and a sport-utility vehicle collided on the westbound 10 Freeway east of Wabash Avenue. The truck veered up an embankment and overturned onto its roof.

A silver Hyundai struck the center divider on the eastbound 210 Freeway west of Milliken Avenue after a tire on the vehicle blew out. There were no reported injuries.

A sedan overturned and landed on its wheels on the westbound 10 Freeway east of Yucaipa Boulevard.