One lane was reopened in both directions after happened earlier this morning. Then - more falling debris.
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Drivers who heard a lane was back open are now stuck and unable to access the bridge, and traffic is piling up across the Bay Area as commuters seek alternate routes home.
VIDEO: Here's where concrete chunks on Richmond-San Rafael Bridge came from, fell
For example, Highway 37 is moving at a pace of about 2-5 mph.
Traffic throughout Marin is practically at a standstill, according to San Rafael Police:
The issue may get worse for tomorrow morning's commute.
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So what next? Watch the video above for a look at what the CHP and ABC7 traffic experts say.
Take a look at full coverage on the Richmond-San Rafael Bridge closure due to falling concrete.