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PITTSBURG — A motorcyclist suffered major injuries when he crashed after colliding with a BMW on Monday morning, the California Highway Patrol said.

The 33-year-old Pittsburg resident on the motorcycle went to John Muir Medical Center in Walnut Creek after the 6:22 a.m. crash, CHP spokesman Officer John Fransen said. The crash happened on westbound Highway 4 just east of the Bailey Road exit.

Police were still investigating how the motorcycle collided with the BMW, Fransen said. The driver of the BMW, a 38-year-old Antioch resident, was not injured, he said.

The motorcyclist may have had a broken leg. His injuries were not believed to be life-threatening.

The crash blocked the two left lanes and caused the CHP to issue a severe traffic alert during the height of the morning commute. Both lanes remained blocked until about 7:40 a.m., when the alert was lifted.

Traffic remained slow for the rest of Monday morning.

Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rdERH

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