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Googlemaps is very helpful with traffic information. It has 4 coloured bands to show density of traffic. Obviously around the Kincardine Bridge on Friday, it was showing 10 miles of red.

How does it get this information?

The blue Trafficmaster speed sensors that you see at the side of roads collate information about traffic speed and congestion to a central office. They are a private company so presumably Google pays them to use their data.

These things:

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Googlemaps is very helpful with traffic information. It has 4 coloured bands to show density of traffic. Obviously around the Kincardine Bridge on Friday, it was showing 10 miles of red.

How does it get this information?

Deeman's explanation makes sense, but I think they also get data through the GPS on car navigation systems. An average speed can be established by aggregating all the cars travelling in the same direction on the same road.

Edited by lichtgilphead
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If I'm wanting to go from Edinburgh up north onto the A9 - is my best bet to go to Stirling first then onwards to Perth where i would join at the roundabout near the stadium/tesco's? Or would i cross the Kincardine bridge?

Tesco's what?

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