SK53
(SK53)
13
@JeroenHoek: yes that seems reasonable, but there are a few laybys in the UK which do have a distinct service road & which aren’t rest areas. Nearly always these are remnants of the original road layout where a road has been straightened or re-engineered & using the original segment as a layby is a good use. I think a true rest area should have a minimum of some facilities, such as picnic tables and toilets.
However, this is just a classic case where things grade into each other and I would not officiously change a tag because someone else’s judgement differs from mine.