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Last year I ran into trouble when I was trying to route on an access road alongside a main through route, which ended up crossing a couple of fields of cabbages. All trying to avoid about 100m of road which was banned to bikes!
rj-
Yeah, I've had lots of little re-routes for that kind of thing. Hungary was pretty bad with its bike bans on roads. Often there'd be a path but then it'd be ripped up because of construction so you'd have to go around. Had similar issue in Italy I think on a path that kind of stopped and I couldn't work out how to get across a major road, cue lots of back and forth. Even in innocuous places like a little town in France I remember looping the town about three times because I couldn't work out how to exit it! Oh and the fucking RAB last year where every exit seemed to be a motorway. In the end I looked at the tracker and followed skinny's route for about 200k - there were only about 3 turns in that whole time but I'd wasted like an hour riding every exit trying to work out what wasn't banned. Think that was Hungary too. So fucking annoying. I think I had a hotel booked that night and it took twice as long as expected to get there so I didn't arrive until 6am or some shit and then left late. At least no Hungary this year.
hippy
No different to getting to a road that's not actually there (done that), no longer allows cars (done that), unrideable sand/gravel (done that), fenced off (done that) and having to re-route around it on the fly. Online mapping is definitely not perfect.