I had an incident like this in the US. permalink.

The angle between incoming and outgoing segments is 177 degrees and the median segment is 14 m - the u-turn prevention rules should be followed.


Have the rules for u-turn prevention changed?

https://i.imgur.com/18FGIn6m.png
I thought some more about my example.
I did report in the UR an illegal u-turn that did not follow a reroute or come immediately after the start of a route.

But the example I showed in the route tester is not a fair example because I gave waze very few options. This points out a known weakness of this kind of u-turn prevention. This u-turn prevention is not absolute, like red arrows are. If all other options involve higher or absolute penalties (such as defying red arrows or driving through parking lots) or "long enough" distances, the u-turn prevention penalty will not be great enough to prevent the u-turn. I cannot reproduce this illegal u-turn with a "fair" example.

Two things:
1) I still do not trust this form of u-turn prevention. So I prefer bow-ties, "z-segments" and other ugly solutions whenever I can get away with it. But that does not follow the guidelines, so I do this rarely.
2) The u-turn arrows should really be enabled on a lot of roads. This would give waze a better chance of turning wazers around legally when required and avoiding some of the situations where a u-turn should be prevented by the penalty is not large enough compared to penalties on other routes.

Here is the unfair route. u-turns are prevented everywhere! other options for turning involved parking lots or long distances.
https://i.imgur.com/lllwbGSm.jpg

If I give waze something much closer to the route I was driving that day, then it makes different choices.
https://i.imgur.com/ZUxeH0Qm.jpg

Sometimes, even if I give it the difficult route, it takes a longer, but still legal, choice.
It surprises me that the illegal u-turn sometimes beats this route:
https://i.imgur.com/LuDTR12m.jpg

Permalink
Does anyone have a clue on what is happening here? User was directed past an intersection to do a U-turn, whereas he just needed to turn left. I was suggested to make note of it in this thread (coming from here