Off and On

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Off and On

Postby dknight212 » Sun Jul 28, 2013 4:24 pm

Thought it might be useful (or at least give us a space to vent frustrations) to pull together a collection of routing off the main highway and back on again. Getting quite a few recently. Here's M25 (ACW) at J11:

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https://world.waze.com/map-editor/?zoom ... TTTFTTTTFT
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Re: Off and On

Postby dknight212 » Sun Jul 28, 2013 4:35 pm

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Re: Off and On

Postby dknight212 » Sun Jul 28, 2013 4:36 pm

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Re: Off and On

Postby dknight212 » Sun Jul 28, 2013 4:39 pm

Needless to say:

* these junctions usually route fine
* we don't know if the users have long or short journeys
* sometimes off and on can in fact save time, but it's quite rare (I've experienced it once)
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Re: Off and On

Postby faitaru » Sun Jul 28, 2013 6:03 pm

Something to add to this subject. On Wednesday morning I routed from St. Neots in Cambs to Barrow in Cumbria. About 5 hours worth of route. As I came off the end of the M6T I had instructions for coming off at J16
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https://world.waze.com/editor/?zoom=4&l ... n=-2.33901

I recalculated route and the J16 vanished.
I'm assuming it's something that happens on longer routes only, as the off and on again penalties will have less of an impact over a long distance. In the past I've had off/on occurring on the M5 on routes down to Cornwall. Again this is routes of 5 hours+
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Re: Off and On

Postby Timbones » Sun Jul 28, 2013 6:14 pm

Routing is _supposed_ to stick to the Motorway if the road name and type continues uninterrupted either side of the junction. Worth seeing if our hacks to force 'keep rights' are leading to these off-and-on-again routing.

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Re: Off and On

Postby dknight212 » Sun Jul 28, 2013 6:26 pm

Certainly saw them before on the M25 but perhaps the frequency has increased since.

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Re: Off and On

Postby faitaru » Sun Jul 28, 2013 9:17 pm

Don't think it's related to the "keep rights". It's not doing it on the junctions where they occur anyway.

I did think the other day, is it something in the algorithms not allowing you on freeway roads for longer than x time?
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Re: Off and On

Postby Timbones » Thu Aug 15, 2013 3:15 pm

HQ have released some information about when routing will avoid a 'detour' from a major road.
Here's a paraphrase of what they said, as I understand it, of how to prevent detours from happening:

  • Detours go between two segments with the same name, and with the same road type via a different road type.
  • Freeways and Major Highways: Detours are avoided if they are less than 5km.
  • Minor Highways: Detours are avoided if they are less than 500m.
This means, I think, that a) our hacks for keep left/right are probably breaking this mechanism,
and b) large junctions on minor highways may have detours longer than 500m. A typical GSJ has at least 600m of ramps, not counting the roundabout.
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Re: Off and On

Postby leocylau » Thu Aug 15, 2013 8:48 pm

Possibly it is (b). I can't find our hacks on dknight's examples so it should not be (a).

Btw, I maybe wrong. I thought the announced algorithm is only implemented on NA server, not yet on INTL server.
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