I do not trust the roadway bridge clearance signs to be anywhere near accurate. They do not always change the signs immediately after resurfacing a roadway. Our trailer height is 12'7". I set my Garmin RV 760 to 13'6" giving me just shy of a 17" buffer for the Federal minimal bridge height limit of 14' and 11" buffer for a bridge that is 13'6". Any lower that 13'6", I will try to bypass the bridge.
I did notice that in Texas, the regulations show a 3" buffer built into the signage. If the actual measurement was 15'9", the sign would show the clearance as 15'6". However, I still wouldn't trust the sign even with the extra 3". My trailer wouldn't cause much damage to the bridge, but it could total my trailer.
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Carl and Janis
2013 Excel L36GKE
2012 Ford F450 w/Highwayman RV Hauler
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