ORPA - what's it stand for?

[J_D]

Other Route Public Access - I had to find a more recent OS map to find out.

Are these normally useable in motor vehicles, or is it a case by case basis, or are they not useable by motor vehicles?

Anyone know if we can drive on these? Wayfarer has a lot of them listed round my way and only one BOAT (with a TRO ) so am keen to drive some. From searching it seems like they are drivable but can anyone confirm that?