Does Waze consider smaller roads into it's routing?

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Re: Does Waze consider smaller roads into it's routing?

Postby floppyrod84 » Thu Jul 19, 2012 5:44 pm

As far as I can tell there are no problems that would cause this. It appears to be a routing algorithm error.

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Re: Does Waze consider smaller roads into it's routing?

Postby bgodette » Thu Jul 19, 2012 1:43 am

WeeeZer14 wrote:But one single street segment in the middle of what should be a freeway will indeed cause problems.
That's not the case either. The system appears to have different pruning strengths depending on how far A->B is in a straight line. All road types appear to be considered but at ever decreasing run lengths the farther A->B is. There's also a prune based on the ratio of straight line distance vs traveled distance, this was the problem Jenncard originally had for Boulder->Winter Park that has since been adjusted at least twice to some larger number.

From that other thread you saw, my long non-freeway route example tipping point happens to be right around 330km in a straight line.

In any case, as you mentioned, it's best to have your roads Typed correctly for best results. It matters, but not as much as that penalties list would lead you to believe.
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Re: Does Waze consider smaller roads into it's routing?

Postby WeeeZer14 » Thu Jul 19, 2012 12:25 am

RodNav wrote:if there is sufficient historical speed data, why even consider the road type?


Scalability is why. If I am trying to find a route from NYC to LA across all of the US, it would take infinite resources to check every possible route. So we reduce the calculations required and only examine a subset of road types.

If roads have the correct type applied, this works well. But one single street segment in the middle of what should be a freeway will indeed cause problems. That is a map data issue though, and not a routing algorithm issue.
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Re: Does Waze consider smaller roads into it's routing?

Postby RallyChris » Wed Jul 18, 2012 11:20 pm

Take this list with a grain of salt.

Another thread mentioned this list, but real world examples showed that they were not hard fast rules.
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Re: Does Waze consider smaller roads into it's routing?

Postby Antmannz » Wed Jul 18, 2012 11:13 pm

RodNav wrote:
Copied this from the automatic answer:
Code: Select all
Long Distances:
0-15 km - All road types are allows for routing.
15-20 km - All road types except Streets.
20-30 km - All road types except Streets and Primary streets.
30-200 km - Only Minor, Major, and Freeways.
more than 200 km - only Freeways.



That's nuts. Most commutes would be longer than 20km; and here in Auckland the motorways (freeways) are the state highways (major, minor) thereby negating any sort of usefulness whatsoever.
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Re: Does Waze consider smaller roads into it's routing?

Postby RodNav » Wed Jul 18, 2012 9:30 pm

gettingthere wrote:
Shaigan wrote:On the "support" page, enter "penalty" and look at the automatic answer. All is clear for me to understand that smaller roads are taken into trip calculation.


Sure, but any routing penalty for lower classes of roads should be less than a 2 hour traffic delay!


Copied this from the automatic answer:
Code: Select all
Long Distances:
0-15 km - All road types are allows for routing.
15-20 km - All road types except Streets.
20-30 km - All road types except Streets and Primary streets.
30-200 km - Only Minor, Major, and Freeways.
more than 200 km - only Freeways.


Well, that makes it clear that on any route longer than 15km, Streets are ignored in routing. And anything more than 30km only highway and freeway types will be used. I think waze needs to seriously rethink this. In fact, if there is sufficient historical speed data, why even consider the road type? If a Street route is faster than a Freeway route, then it is faster.
Also, why a penalty for junctions? If waze knows the time taken to transit two junctioned segments, it shouldn't add another 5 seconds for the junction. Near my house I cross 3 very close junctions in about 9-10 seconds, but I guess waze must calculate that it is actually 25 seconds. (10 + (3x5))
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Re: Does Waze consider smaller roads into it's routing?

Postby Timbones » Wed Jul 18, 2012 9:52 am

...it really doesn't want to use the A446 - Lichfield Rd either, though I can't see why. Maybe just need more people to drive that way.
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Re: Does Waze consider smaller roads into it's routing?

Postby Timbones » Wed Jul 18, 2012 8:50 am

There's definitely a propblem with the A513 by Weeping Cross, which I'll get sorted right away. There may be some other wrinkles along the ideal map that needs fixing.

In theory, if you keep using Waze, and keep driving the route you prefer, it will eventually start using it. YMMV.
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Re: Does Waze consider smaller roads into it's routing?

Postby gettingthere » Wed Jul 18, 2012 5:07 am

Shaigan wrote:On the "support" page, enter "penalty" and look at the automatic answer. All is clear for me to understand that smaller roads are taken into trip calculation.


Sure, but any routing penalty for lower classes of roads should be less than a 2 hour traffic delay!
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Re: Does Waze consider smaller roads into it's routing?

Postby Shaigan » Wed Jul 18, 2012 5:02 am

On the "support" page, enter "penalty" and look at the automatic answer. All is clear for me to understand that smaller roads are taken into trip calculation.

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