I've travelled the Chesapeake Bay bridge many times, up and down the East coast, Cross-country until no toll roads exist and have never seen a toll booth that wasn't wide enough to handle a dually or RV. Yes, you may want to slow down as the signage tells you to so you won't make a costly mistake. A short research tells me toll lanes can be 9 to 12 feet wide. The latter are the wide truck lanes. Those 9' lanes would be a tight fit for sure. Haven't come across a 9' toll lane yet, but will keep in mind when traveling a new route.
