Google Maps traffic data in Waze

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Re: Google Maps traffic data in Waze

Postby karl_db » Fri Feb 02, 2018 9:36 pm

I rejoined WAZE on the strength of the previous comment as repeated below. So far, I've seen no Google Traffic influence, although the number of Wazers is now higher in Dublin.

"Waze HQ wrote:
We enabled the google traffic data for Ireland now, by next week you will see more jams on the map and better ETA."
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Re: Google Maps traffic data in Waze

Postby alexxys » Thu Feb 08, 2018 11:16 pm

David, thanks a lot for the great news and for pushing the request to the HQ! Sorry for the late "thank you". The notifications from this thread stopped coming to me, so I didn't notice your reply until now.
To be honest I started testing Google Maps during last two weeks and didn't use Waze. But I will be happy to return back to Waze.
Looking at the Waze and Google Maps, looks like Waze still doesn't have traffic data from Google. But let's hope it's just a delay that HQ mentioned.
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Re: Google Maps traffic data in Waze

Postby davidg666 » Fri Feb 09, 2018 9:36 am

alexxys wrote:Looking at the Waze and Google Maps, looks like Waze still doesn't have traffic data from Google. But let's hope it's just a delay that HQ mentioned.

Yeah, my own impression is that there is more heavy traffic shown on the Waze map, which is a good thing - but I rarely drive at peak times, so it's quite possible that a lot of heavy traffic is still missing.

However, there have been reports of traffic not showing up as much as it should (compared to Google maps), so we've sent specific examples on to Waze HQ, and it's being looked at...

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Re: Google Maps traffic data in Waze

Postby alexxys » Thu Apr 12, 2018 10:40 pm

Waze still doesn't see many traffic congestions that Google sees and makes very inaccurate ETAs during peak hours when Google makes much better ETAs. So import of Google traffic data to Waze definitely doesn't work properly.
David, do they need more examples of such issues? I could send them some.
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Re: Google Maps traffic data in Waze

Postby davidg666 » Fri Apr 13, 2018 8:03 am

'morning Alex,
alexxys wrote:Waze still doesn't see many traffic congestions that Google sees and makes very inaccurate ETAs during peak hours when Google makes much better ETAs. So import of Google traffic data to Waze definitely doesn't work properly.
David, do they need more examples of such issues? I could send them some.
More examples would be great. If you post them here I'll send them on to our community contact in Waze HQ - thanks!

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Re: Google Maps traffic data in Waze

Postby alexxys » Sun Apr 15, 2018 8:43 pm

This is an example from today.
Waze didn't see a standstill traffic near Dundrum Shopping Center.
Date/time: April 15, 2018 2:16pm UTC+1
Start/end points of the route
Will try to catch more similar issues next week.
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Waze.png
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Re: Google Maps traffic data in Waze

Postby davidg666 » Mon Apr 16, 2018 6:59 am

alexxys wrote:This is an example from today.
Waze didn't see a standstill traffic near Dundrum Shopping Center.

Thanks Alex. I've passed this on to our community contact in Waze HQ. I've also asked them whether Google Maps has access to a different source of traffic congestion that might not be available to Waze - that could provide an explanation.

I'll let you know what I hear back.

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Re: Google Maps traffic data in Waze

Postby alexxys » Mon Apr 16, 2018 9:50 am

Thanks David!
I have a theory why Waze doesn't see heavy traffic in some places but sees it in others. And it correlates quite well (not 100% always though) with what I see on the maps. Looks like the issue happens on the roads that have different names on Waze and Google maps.
I suppose Waze may import not raw GPS tracks from Google maps, but traffic data in some preprocessed form. Google maps may link each GPS track to a road. Waze may take that preprocessed data with road names and try to correlate it with its map by comparing the road names. If a road name differs it may not able to correlate Google data with its map, so it may not able to import such data.

On the other side, in the places where I definitely saw heavy traffic correlation between Google and Waze, road names were always the same.

Some proofs of the theory:
- My yesterday's example: Google's road name is Wyckham Way. Waze's name is Ballinteer Rd.
- Another example where I saw significant traffic mismatch: Google's name is Stocking Ln. Waze's name is R115.
- Another example: Google doesn't have a road name. Waze's name is Ballycullen Rd.

May be worth forwarding it to Waze HQ as well.
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Re: Google Maps traffic data in Waze

Postby davidg666 » Mon Apr 16, 2018 10:03 am

alexxys wrote:I have a theory why Waze doesn't see heavy traffic in some places but sees it in others. And it correlates quite well (not 100% always though) with what I see on the maps. Looks like the issue happens on the roads that have different names on Waze and Google maps.

That makes sense to me - I suppose it has to match on something, although you'd hope that roads that cover almost exactly the same path should be enough - after all, countries with multiple languages could easily have a mixture of road names in the different languages.

alexxys wrote:I suppose Waze may import not raw GPS tracks from Google maps, but traffic data in some preprocessed form. Google maps may link each GPS track to a road. Waze may take that preprocessed data with road names and try to correlate it with its map by comparing the road names. If a road name differs it may not able to correlate Google data with its map, so it may not able to import such data.

On the other side, in the places where I definitely saw heavy traffic correlation between Google and Waze, road names were always the same.

Some proofs of the theory:
- My yesterday's example: Google's road name is Wyckham Way. Waze's name is Ballinteer Rd.
- Another example where I saw significant traffic mismatch: Google's name is Stocking Ln. Waze's name is R115.
- Another example: Google doesn't have a road name. Waze's name is Ballycullen Rd.

Do you think Google is capable of disregarding the R115 (or similar) that we use at the start of road names and just using the name part that comes after the number, assuming we have it? We do have quite a few roads where we just have the number (like "R115" and nothing else.

We should ideally add the proper road name, but not necessarily what is shown on the Google map, both because we must not copy information from the Google map and also because it's frequently wrong anyway. I hope we get information from Waze about how it matches roads on the Google map with roads on the Waze map. You'd hope that it doesn't just use road names, but matches based on the physical location of the roads!

alexxys wrote:May be worth forwarding it to Waze HQ as well.

I pointed them at this conversation when I sent the email this morning, so they should hopefully read everything in here.

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Re: Google Maps traffic data in Waze

Postby alexxys » Mon Apr 16, 2018 10:18 am

davidg666 wrote:Do you think Google is capable of disregarding the R115 (or similar) that we use at the start of road names and just using the name part that comes after the number, assuming we have it?

Perhaps it's not a problem for Google/Waze. It's difficult to say for sure but for example here Waze's name is 'R110 Crumlin Rd' but looks like traffic is imported correctly.
Another example: R117 Sandyford Rd. Yesterday heavy traffic looked ok in Waze here (see my screenshots above).
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