A 63-year-old driver died after the Chevrolet pickup he was in swerved into oncoming traffic and caused a head-on crash in Ramona on Wednesday, according to a California Highway Patrol official.

The collision was reported around 3:30 p.m. when the pickup truck, for still unknown reasons, veered across traffic lanes on west state Route 78 near Salmon Road, Officer Jared Grieshaber said.

The pickup entered eastbound lanes and hit the front of an Isuzu box truck, Grieshaber said.

The 63-year-old man died before he could be taken to a hospital. The box truck’s 46-year-old driver was uninjured.

Neither alcohol nor drugs were believed to be factors in the crash, Grieshaber said.