[toast0]

The US ADA requires reasonable accomidation, which is wishy washy, but lots of new construction nature paths in hilly terrain just have steps, because there's no room for a ramp and an elevator would be unreasonable.

Even new construction train stations don't always get an elevator to go over or under the line to the other platform... although they do get a long ramp and a ramp on the platform to load if the car floors are above the platform.

If these crossings are really in the middle of nowhere along muddy footpaths, I think you could get away with no ramp in the US, too.