In one case there is a road where a two way section comes to a divider and becomes two one way sections for a while. The suggested route came along one of the one way sections, then turned about 340 degrees to go down the other side of the road. It may be legal to do a u-turn there, but I don't think it's safe, or even possible for most cars. I was thinking about it, and many other divided road are similar where they split/join. Should we be putting no u-turn restrictions on these? There's no actual signs.
No. The router should know not to do this. Likewise as below the router should not make u turns at traffic lights.
The other thing I was wondering about is traffic lights. Where I live, it is illegal to do a u-turn at an intersection with traffic lights unless there is a sign allowing you to. There's no signs saying not to, you're just supposed to know. There has been some discussion in the past with routers that have this sort of knowledge built in. Did anything come of this, or should I just start putting four turn restriction relations on all the traffic light intersections in my neighbourhood? That's going to be painful, not to mention causing a lot of road splitting. Stephen
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