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"Hump back bridges" can be a hazard in themselves with visibility and threat of grounding. To keep them safe with an adequate flat top would mean a long rise on each side taking much land and material.
I have an idea which I think would solve the problem and I don't think it's been suggested. Why not have gates which open out over the road, perhaps painted white with some red warning signs, with someone in a box at the side of the track to operate them? He/she could also operate signals to control the trains?? Seems simple enough ;-)
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