highway=motorway_link does not imply oneway, fixes #1662

[daniel-j-h]

For #1662.

References:

• http://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway_link#Tagging_oneway
• http://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway_link
• http://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway

[daniel-j-h]

a -> i should always have been on ramp and not off ramp, or am I missing something here?

[MoKob]

You are exiting the motorway abcde at this point. So chi is an off ramp (its not about getting on / off the ramp but whether you are leaving / entering a motorway)

[daniel-j-h]

Fixed the on/off ramp test cases relying on implied oneway.

[TheMarex]

This will probably degrade the routing performance initially.

@planemad keep a look out to routing bugs that would occur here after the next OSRM release. Do you think we could add the non-tagged motorway_link roads to to-fix?

[planemad]

@TheMarex unless this causes routing failures, it might be hard to keep a track of routing bugs unless explicitly reported. In the meanwhile, we can detect such ways and load into to-fix for a community review.