You are not logged in.

#1 2019-11-18 19:35:07

gpserror
Member
Registered: 2019-05-13
Posts: 9

No U-Turns on straight sections of road... map or unmap?

Suppose there's a bridge over water (or other section of road) where there isn't a center divider.  There's a sign that says "No U-Turn".

Does one map this?

Normally one waits until an intersection before making a U-turn because there's some expectation of traffic temporarily going orthogonally to the expected travel direction.  Plus it's typically (but not necessarily) illegal to make these turns depending on locale.

I've seen people map these by splitting the way and using the endpoint as the via for the no U-turn though that endpoint isn't really an intersection.  Should these restrictions be removed from the data?  If not, for consistency, no u-turns be added to the data if there's a sign but no intersection?

Offline

#2 2019-11-19 05:44:01

escada
Moderator
Registered: 2011-08-13
Posts: 1,609

Re: No U-Turns on straight sections of road... map or unmap?

The navigation programs that I use have never said "make a u-turn" on such stretches. I doubt it has to be mapped. Apps should only request u-turns at intersections.

Offline

#3 2019-11-19 08:55:12

gpserror
Member
Registered: 2019-05-13
Posts: 9

Re: No U-Turns on straight sections of road... map or unmap?

Yeah, that's what I would think.  Normally U-turns are done where it's possible to see a vehicle traveling orthogonal to your current direction for other reasons - this is at an intersection.

Now suppose someone did put it in, should these be removed?  If not, how should programs that consume OSM treat these, should they simply be ignored (target application: mkgmap.  Seems to give funny errors when it encounters these...)

Offline

Board footer

Powered by FluxBB