The Chesapeake Bay Bridge Tunnel propane turnoff requires you to pull off at the inspection area. The attendant checks that it's off and writes down your tag.
I have heard that if you don't stop at the inspection area you may get pulled over by the Virginia State Police.
Earl & Sharon, 2008 Fleetwood Expedition, ISB 6.7
1995 Jeep YJ/2013 Chevy Sonic