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Nowadays, there are a lot of traffic applications that help us to choose the better path to being arrived at the destination.
Therefore, it's the common question for people, "How does it work?"

I need some professional information about it. Please tell me in deep detail.
Any help would be appreciated.

UPDATE:
I don't mean "How does Google know where I am?" or something like that which asked in THIS link.

Look at this picture and you'll understand my objective.
enter image description here

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  • @beeshyams No, I just updated the question.
    – M. Rostami
    Dec 27, 2019 at 15:46
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    "Google Maps check the traffic by tracking moving of Android phones on roads." Question is about a Google's proprietary product, not Android.
    – Irfan Latif
    Dec 27, 2019 at 15:50
  • @IrfanLatif Thank you. Now I got something.
    – M. Rostami
    Dec 27, 2019 at 15:54
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    when i am on the freeway at 3:00 a.m. it shows me yellow (slow traffic). but in fact the road is free, not much traffic, except for 90% of vehicles are trucks (which have speed limit). this makes google believe all cars driving unusual slow fossbytes.com/google-track-live-traffic
    – alecxs
    Dec 27, 2019 at 16:04

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I can't go into 'deep detail' about the exact mechanics as I simply don't know them.

Google own the 'social' navigation app Waze. Waze allows you to report traffic accidents and roadworks and such so that other users can be made aware of them before they get to the affected area and, hopefully, adjust their route accordingly.

One of the permissions you give Waze in exchange for this free service is the permission to track your location.

Waze and Google then use this information to calculate your speed.

Obviously live traffic mapping wouldn't work very well if there was only one person using the app. Thankfully many people use Waze every day and Waze and Google use the data from all users to accurately map out traffic jams and calculate average speeds and journey times.

I can't say for all places but, in my local area I know the local radio station help to report traffic accidents and roadworks on Waze and also use Waze for their traffic updates.

For a brief explanation on Waze specifically you can read this page https://support.google.com/waze/answer/6078702?hl=en

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