[OSM-talk] [Tagging] - RFC -Motorway_linkimpliesoneway=??

[Stephen Hope]

2008/10/9 Matthias Julius <lists at julius-net.net>:
>
> This leads to a nightmare.  Those rules would need to be implemented
> in every tool that works with OSM data (and cares about oneway
> properties).
>

It's a nightmare we're probably going to have to address at some point
if we want to do good routing. There are many traffic rules that are
local, affect routing, and are not explicitly signed on the roads.

Here's an example. In Queensland (and I think the rest of Australia)
it is illegal to do a U-turn at traffic lights unless there is a sign
that specifically says you can. It is legal to U-turn at road
junctions without traffic lights unless there is a sign that says you
can't.

If you want a routing application to take this into account, we're
going to either have a local rule that says "Don't U-turn at lights
etc" or get every intersection with lights mapped with U-turn
restrictions in every direction that aren't signed in the real world
(good luck with that).

Stephen