Thanks for your reply! I’m happy to help out with testing if needed. I didn’t supply a link to the intersection as i fixed the lane tags afterwards, but here’s another nearby example osm.org/#map=19/-41.336413/173.181508

Perhaps defaults for amount of lanes if untagged based off countries could be a good idea but that might be a lot to manage. Have you considered if you aren’t already, defaulting to a different amount of lanes based off what type of highway it is?

Looks like an awesome tool and I’m excited to watch its development.

It seems to break quite badly in left hand drive countries, not accounting for the difference in driving sides of the road. If lane count isn’t set its assumed to be one which doesn’t make sense when a road isn’t tagged as one way. this leads to some very confusing situations such as the sample intersection below.

looks like an awesome project!