be forwarned. trusting the GPS for bridge or tunnel clearance is somewhat fraught with issues. One major one we have encountered is that the bridge data is based on what the state has listed on clearance. and in some cases that will give somewhat bogus or useless info, some post the minimum SIDE clearance rather than normal overhead traffic lane clearance. and hence will try to route you around areas you can go through.
As an example SR-14 in washington according to my GPS says I have clearance problems with tunnels as well as 101 down the coast. but in all cases overhead clearance is just fine, it's the out of traffic lane edge clearance that is sometimes near 10 feet and that is what GPS gives for clearance.
So, while useful, it isn't always accurate and can send you on a wild goose chase.
