The project page: https://slowways.uk/ As they say, there are many paths in the UK but it can take a lot of research to find long routes that don't leave you on a busy road with no pavement. I hope this project is a success and can't wait to use it.
Yes. Or some footpaths cross major roads with no real crossing in place. It's a bit scary using this foot path crossing, especially in poor weather or at night. Cars can travel at 70 mph (112 km/h) on this road. https://www.google.co.uk/maps/@51.6832617,-1.9031193,3a,75y,...
It's got more of a wooden frame up and down the embankment, a Public Footpath sign and look right / look left warning paint.
It looks like a poor compromise to retain an existing right of way when building or upgrading the dual carriageway.