The often trafficky Highway 37, which connects northern Marin County and Sonoma County to Napa and Vallejo, was shut down in both directions Friday after following a major injury crash involving two big rigs.

For commuters and truckers alike, the shutdown of Highway 37 could mean a major detour headache if you're trying to traverse this section of Sonoma County, and the CHP has not provided any estimate for when the highway might reopen.

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The crash happened around 1:24 p.m. in the eastbound, single lane of Highway 37 east of 121, toward Napa. An initial report suggested a big rig and two cars were involved, but it now looks like two big rigs were involved. It's unclear how many people were injured.

As KPIX reports, a medi-vac helicopter was at the scene as of 2:25 p.m. Traffic may have started to be allowed through in the westbound lane, though that was unclear.

All eastbound traffic was being diverted onto Route 121.