Having just completed my first survey, I'd like to clarify what "% on roads" actually means. I've interpreted it to mean the percentage of a route for which one has to walk on the road surface of a public road. This means either that there is no footway/pavement/verge or there is something about the footway/pavement/verge that means it is unsuitable for walking on (it might be too narrow or too uneven - an unsuitable footway/pavement/verge may still be capable of proving a refuge from traffic).
A public road is a road that is maintained by a highway authority. I exclude private roads, such as farm access roads, forestry roads, golf course access, reservoir access etc. I might make an exception to this if the private road was in relatively frequent use (for example to provide access to a car park).
Is this a correct understanding of what the percentage means? It means that most road usage in rural areas will contribute, but that usage in urban areas will not (because there will usually be adequate pavements).
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