It's not new (not even new in rail applications). One of the key drivers for cheaper and easier footbridges is to close level crossings. In the UK we have tons

It's not new (not even new in rail applications). One of the key drivers for cheaper and easier footbridges is to close level crossings. In the UK we have tons of crossings - footpath, private road, and highway - dating back to Victorian times, and Network Rail would like them gone. They're one of the biggest remaining sources of injuries and deaths on the network, especially on 125mph fast lines, and are operationally awkward. They got rid of a bunch of private farm crossings during our Foot and Mouth Disease outbreak by going door to door with desperate farmers and offering wedges of cash to give up their private crossings. They care a lot.