I had a bit of an interest in tagging speed limits a few years back. It's way more complicated than it should be in the UK. Researching led me down a bit of a rabbit hole of legislation & case law.
I made the following personal notes about UK limits and how to recognise them, which I think is mostly correct. https://wiki.openstreetmap.org/wiki/User:Jamicu/UK_Speed_Limits I personally tagged restricted roads as maxspeed:type=UK:nsl_restricted All a bit of a mess though. Jason
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