Help to determine cause of unusual routing in New Hampshire

[Chronos74]

Hello all, bringing this discussion from the NER discord #new-hampshire channel for more eyes on this. Access to the NER Discord server is through the form at: https://goo.gl/forms/X24ENSZ6ANw2sQpV2

We have a UR for incorrect routing in Candia, NH. The reporter was instructed to exit SR-101 at the Candia, NH exit and immediately get back on it. SR-101 is a limited access freeway in this part of the state. Original UR is: https://www.waze.com/en-US/editor?env=u ... st=7891618

We have confirmed the routing received via the live map, entering a starting point of Dover, NH and a destination of 20 Constitution Dr, Hudson, NH 03820. When SR-101 is not the preferred route, it instructs you to exit SR-101 in Candia. If you find a time where SR-101 is the preferred route, then you are not instructed to exit. Screenshot is below. Link to live map at 7:00am showing the detour off SR-101: https://www.waze.com/livemap?lon=-71.31 ... xt=07%3A00

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PL for segments around that exit: https://www.waze.com/en-US/editor/?env= ... 2,88199551

Route Speeds info - A: -71.38749, 42.77614 and B: -70.874441, 43.183301 - usually the relevant route is Route 2, as most of the time the quickest route does not take SR-101.

From voludu2:

If I stick with 7 AM and experiment with the endpoint, then by the time I move it back close to where the blue and pink lines come together, I start getting the pink link on 101 but not taking the ramp detour.
If there were no such thing as BDP, or if we had done something to "break" BDP, I can't see a reason for waze to prefer the ramp detour.

We tried different times on live map, for example 7:00am and 7:30am, for 7:00am SR-101 was the second route and involved the detour, and for 7:30 101 was the first route and did not involve the detour.
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There was also a discussion about the Waze u-turn penalty, voludu2 says that there is no 3-segment u-turn penalty here.

Thanks in advance for any and all assistance!

-Dave

[moogonk]

Hi. I'm wondering if there are any other theories about this issue prior to our telling the reporter that we have no idea why this happened.

Any thoughts, please?

[Kartografer]

A detour can be the second or third route. That doesn't indicate that the penalty is missing

[moogonk]

Ok, but the reporter received the route as the first route, not the second or third.

[Kartografer]

Ok, but the reporter received the route as the first route, not the second or third.

Right. I was trying to clarify, because if you can get the detour as the first route in LiveMap or in the app at a certain time, that makes it reproducible and testable. If not, it's not reproducible, so it's hard to explain.