If I remember correctly, back in the day placarded trucks couldn't run under the apartments east of the George Washington Bridge on I-95 in NYC. We had to exit the expressway and run across on local streets (178 St. I believe) for a short stretch before getting back on the Cross Bronx. Lots of drivers hid the hazardous bills and flipped the placards to avoid doing that.I ran tunnels a few times , guess I forgot to put the placards on ??? But no different than a Ship with hazmat on steering into a bridge ................