As someone has already said, know your height in meters. On our first trip into CA several years ago we turned a corner and there about a half block ahead of us was a RR overpass and the sign said 4 Meters. A quick scramble of brain cells told me that since we were less than 13 feet we were ok.
In Quebec all road signs are in French which isn't hard to follow normally but on our last trip in Sept. of this year driving through Montreal our route was totally closed for major reconstruction. Fortunately the French word for detour is spelled d e t o u r.