If the escort vehicle is a large pickup , therefore no comparison to a lowboy , how is he going to warn the lowboy ?
No signs = trouble , simple . The alternative , route survey , is so expensive that it puts anyone off doing it . No , as long as they have a fall guy , the truck driver , nobody gives a toss . The argument that the driver should know ground clearance hardly merits a response if he does not have an algebraic formula for calculating the hump/bump ratio . Even then , where exactly does he cross ? In the middle ? To the left ? No , I am afraid that is nonsense . In any case , he does know the ground clearance . If you care to watch a lowboy moving , you will note that the centre of the bed bounces up and down because of uneven road surfaces , so the clearance is a bit arguable anyway . Then of course , the truck driver slows down to avoid hitting the high points during the bounce so the inertia that would give a small scrape becomes nil and the truck stops altogether . Try driving an HGV and then give reasoned comments .
If the railways were to cooperate , and allow prior setting up of temporary ramps to allow clearance (as done in most European countries) it would not happen , but that would inconvenience the railroad . But rather less than the mess shown . Temporary ramps can be as simple as a dumper load of sand spread in the road .
People driving to race the train to a crossing need shooting of course , there is no excuse for that .
Mike (bin there , dunnit)