CASTRO VALLEY (CBS SF) — A tractor trailer fire on westbound I-580 has caused a traffic alert Monday afternoon, shutting down the right lanes of the freeway for over four hours, according to authorities.

At 1:50 p.m., CHP reported the fire and issued the severe traffic alert about the incident on westbound I-580 east of Eden Canyon Road.

Video shot by Chopper 5 showed that the entire cab of the truck had been destroyed in the fire, but crews appear to have extinguished the blaze. A single lane of westbound I-580 was open, allowing a trickle of cars to pass through.

As of 6:20 p.m., CHP reported that all lanes were open. Motorists are advised to expect residual delays and to use alternate routes to avoid the area.