"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 ;-)

That system would be open to even more abuse
Think about it if any idiot can stop a train whenever they wanted CHAOS.

I will say this again 99.9% of crossing accidents are caused by misuse
Make crossing misuse a costly offence say six points & £1,000 fine or an instant driving ban(1year)

Very amusing! As we used to say in the good old days: "if it aint broken dont try to fix it!!"
Cheers
Phil

Question: If you go through a RED traffic light & you get hit by another vehicle whose fault is it? YOURS!
SO: If you go through a RED flashing light at a level crossing & you get hit by a train whose fault is it AGAIN YOURS.

You can make these crossings fool proof you can't make them idiot proof.

Looks like action is being taken in Wales.

http://www.bbc.co.uk/news/uk-wales-22480502

Seems to be the only way unfortunately. Like I said before it will ultimately cost us a fortune and take away some of our heritage by way of the removal of gates, signal boxes and manned crossings! All for the sake of the idiot who thinks he or she knows best, by beefing the train!
All the best
Phil

It looks like as if these are crossings without barriers (Pictured)
There are many of these scattered all over the railway system mainly on lines with few trains & little population.
These crossings were about in steam days so why the problem now?
I'm off to Wales tomorrow the line from Shrewsbury to Machynlleth has a few of these crossings you can hear the warning sirens on the train on approaching them there are also flashing lights......................so is it a case of DRIVING WITHOUT DUE CARE & ATTENTION?

Did a trip along the Cambrian this week (Tywyn to Porthmadog) there are four types of crossing on that stretch of line :
Full barriers,Half barriers,No gates but with warning lights & Gated with no warning lights(farm crossings)

I have not heard of any accidents or close shaves on that stretch of line.