Google - Traffic Info

[Hopkirk]

When I go on Google Maps I can choose to see traffic flow. It is shown as green or in varying shades of orange turning to deep red.

Where do they get this information from?

I had assumed there were sensors in or beside the roads, but I see information for even fairly minor roads.

I now wonder if they are taking it from the speed that peoples' mobile phones are travelling.

[Buenchico]

>>>I now wonder if they are taking it from the speed that peoples' mobile phones are travelling

Well done, Sherlock!
https://www.ncta.com/platform/broadband-internet/how-google-tracks-traffic/

[SlackAlice]

Probably from something like this

http://www.teletrac.co.uk/trafficmaster-traffic

In the early days you could see there 'traffic counters' looking like dark blue cameras on top of lamp posts or hanging under bridges.

[SlackAlice]

I stand corrected, lol

[Hopkirk]

Thanks Chris.

I had doubted it as I thought pedestrians would mess the system up, but they explain that when they talk about the postman.