Often they are paying more attention to where the GPS tells them to go instead of their surroundings. They will ignore the signs, warning lights, chains and everything else that is put up to warn people just because TomTom told them to go that way.
So far the east end of it has been demolished twice by 18 wheelers trying to fit through it.
In each case the drivers were following the route instructions given by them from their home offices.
The height is clearly marked as well as the weight limit, 9 tons, as you approach it.
The bridge went over a hundred years without suffering this kind of damage caused by the blind use of information gleaned from sources on computers and GPS.