Road Priorities: Stop Signs, Give Ways

[daniel-j-h]

For #2652 and #3003.

The goal is to pick up stop signs and give ways from the data in the profiles, determine the way direction the node tags apply to, pass it through the pipeline and eventually influence turn penalties.

Already opening here so we can discuss. WIP.

After double checking the tagging schemes, relation-based tagging is not really an option:

• http://taginfo.openstreetmap.org/tags/type=stop
• http://taginfo.openstreetmap.org/tags/type=give_way

Tasklist

• detect a way's direction by checking distance to next intersection
• stop signs: tags on intersection node vs tags on node approaching intersection
• priority_road tags skip these first two steps; attach to edges directly
• influence turn penalty
• add regression / cucumber cases (see docs/testing.md)
• review
• adjust for for comments

[daniel-j-h]

Plan for handling arbitrary node penalties is in #3021 (comment) - I rebased this onto master and ripped out the WIP stop sign / give way sign work. @MoKob want to have a look and incorporate this into your turn function work already?

[daniel-j-h]

This was de-prioritized. It's is blocked / goes hand in hand with #2912.
Not considering it for the 5.7 release.