LP through tunnels

[greengiant]

I was traveling last week(not with TT) through some tunnels on 476 near Allentown, in Norfolk on 64, and over/under the Chesapeake Bay Bridge tunnel on Route 13. I wonderered for my future travels and hopefully others as well, whether TT's with 20 and 30lb LP tanks need to stop for inspections before those tunnels or if that is only for larger built in LP tanks onboard, etc. Just curious as I saw plenty of motorhomes, TT's, and Fiver's running through. I guess each tunnel might be different and any driver like myself should check the rules or pull over if unsure. Thanks