There is actually signage alerting people to this hazard, as is the norm, in addition to the lower limit. Ironically, there is a low bridge a mile before this

There is actually signage alerting people to this hazard, as is the norm, in addition to the lower limit. Ironically, there is a low bridge a mile before this bit of road with huge signs alerting truck drivers that it is quite a bit 'lower' than they might be reckoning on. Guess what, it still gets hit - so much so there is now flashing light signage in addition and, thus far, this has also proved ineffective. I'll save the red traffic light signal example for later...