An interesting write up of an interview with the Edinburgh Spokes cycle campaign.
"Spokes also started producing cycle maps at that point [in the 80s]. Partly you produce a cycle map to show people where the nice places are, whether it's off road routes, quiet streets or whatever, to just show them that it is possible."
"But it's also a campaigning tool, because the map shows you the gaps."
https://road.cc/content/feature/spokes-campaign-group-interview-316445
