DennisOSRM/Project-OSRM — Issue #65: u-turns right after intersections?
Author: emiltin
Created: 2011-12-17 16:41:06+00:00
State: open

there are numerous places in osm where a street changes into two parallel one-way streets. often at intersections. like here:
http://www.openstreetmap.org/?lat=55.671981&lon=12.57939&zoom=18&layers=M

this is often in relation to intersections. in effect you have three way meeting: two oneways separated only by a small angle, and a bidirectional.

osrm is happy to enter one of the oneway streets, do a sharp u-turn, and leeave out the other oneway. often this means you're leaving an intersections, do a u-turn right outside the intersection, and then re-enter the intersection.

i'm not really sure this is a bug; but the maneuver certainly seems untraditional. especially since these situations often occur at large roads (since they're the one that are typically divided at intersections).

http://localhost:5000/viaroute&start=55.671663936787,12.578800734469&dest=55.671733515879,12.57862370868&z=18&output=json&jsonp=showResultsRoute&geomformat=cmp&instructions=true