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The port of Pittsburg is teensy and the port of Stockton is specialized. Container traffic at Oakland is pretty heavy and many cars are offloaded at Vallejo. There are also the oil terminals at Richmond and elsewhere.

Thanks, I wasn't thinking hard enough! I've driven past those terminals in Richmond and Vallejo but haven't paid enough attention.

One note about the bridges: Basically, any elevated section of road seems to qualified as a bridge. That's why you can follow the interstates on the map; they're full of overpasses.

A lot of the NY freight is probably going into Port Newark-Elizabeth (Which is considered part of the Port of NY and NJ) but the resolution isn't high enough to show that. So there's probably not nearly as much freight going into NY proper as there looks to be.