Mapping dedicated cycleway on pavement temporarily merging into main road

[skyper]

This is a common layout of an intersection. If you want to map it in more detail, I would exactly do what you suggest:

@Teogramm

I thought of creating a way from the pavement onto the main road and adding all the appropriate lane tags, but I am wondering whether this might create routing issues (i.e. routing software perceiving it as a slight left turn where there is none).

I would add two short new (, vertical diagonal) ways, one from the “sidewalk” highway=cycleway to the main highway and “after” the intersection one from the main highway to the “sidewalk” highway=cycleway with following tags:

highway=cycleway
bicycle=designated
foot=no (or maybe access=no)
oneway=yes
cycleway=link
placement=transition

• Access tags might depend on the country
• cycleway=link gives the detail that the way’s primary purpose is a link for routing
• placement=transition is the tag to say that the way’s placement is not in the middle of the road/way but somehow diagonal and that angles on both sides are off or virtual. It’s a pity, thought, but many router software do not use placement=* atm.

Then we need to adjust the surrounding ways:

• The sidewalks around the intersections need to be downgraded to highway=footway, footway=sidewalk
• The main highway needs cycleway tags as proposed. Mainly cycleway=lane though there are more tags for further details.
  • If the main highways are tagged in detail with *:lanes tags these tags’ values need to be adjusted and cycleway:lanes[:forward/backward]=* and bicycle:lanes[:forward/backward]=* need to be added. (Forward resp. backward depend on the way’s direction)

In general, I miss some tags for more details about the separately mapped sidewalks/cycleways:

• On the main highway, I would add a cycleway=separate resp. sidewalk=separate
• On the separately mapped cycleway/sidewalk, I would add a cycleway=sidewalk resp. footway=sidewalk.

Hope this helps. Feel free to ask further questions for deeper details as comment.