DISCOVERY BAY — A deadly week on East Bay highways and roadways continued Thursday when a head-on crash killed one driver and left the other with major injuries.

In a statement, the California Highway Patrol said one of the vehicles crossed double-yellow lines, causing the wreck. It happened on westbound state Highway 4, just east of Discovery Bay Boulevard.

It was the fifth fatal crash on the highway this year. Six people have died in those wrecks.

The CHP said it has ruled out drugs and alcohol as factors in the wreck.

The crash became the third one on an East Bay freeway or highway since Monday. A 29-year-old Petaluma man died in a fiery wrong-way head-on crash on Interstate 580 near the Richmond-San Rafael Bridge on Tuesday. About seven hours later, a 20-year-old Concord man cras

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