That is very sad. I try to really watch the signs and just be aware in general as things happen fast on the road.
Years ago I got a Class B CDL and during my driving test she sent me on a short section of interstate, and of course under an overpass. On the other side she asked "What was the clearance of that bridge?" I answered that it was not posted, she just looked at me and said I failed, and to show me she had me exit and loop around. We got back to the bridge and sure enough there was no sign, DOT must have taken the sign down. She just laughed and said to head back to the start. I passed.
2002 Damon Escaper (Sassafras). 3126E Caterpillar, Allison 6 speed.