Big-rig explosion closes I-80 ramps to Hwy 37 in Vallejo

Also, southbound Hwy 29/Sonoma Blvd to westbound Hwy 37 is closed.

An Ace tractor-trailer plunged dozens of feet off a ramp and exploded.

Motorists are advised to avoid the area and expect delays. There is no estimated time to reopen the roadway.