Tomtom Hd Traffic - How Does It Work? Options

[Andy_P]

TomTom HD Traffic - How does it work? (and what do the symbols mean!)

This is compiled from the TomTom HD Live website and the Gox40 on-line manual, so I make no comment on the accuracy (discuss that in the main forum!)


How is the speed of a traffic jam determined?

TomTom uses multiple up-to-the-minute sources to determine the speed of a traffic jam.

* Data from Vodafone's GSM network. Vodafone knows when and where telephones are linked to a mast and where they are moving. This information is anonymised and sent to TomTom. TomTom uses this information to calculate the speed with which every telephone in a car is moving. In the case of traffic jams, cars move more slowly and thus the telephones move more slowly too.
* Data from TomTom users. Certain TomTom devices send anonymous information about their location and speed once the user has given permission to do so. Certainly when information from many different users is combined, this results in reliable traffic jam information.
* Data from third parties such as national and local governments and commercial traffic information providers.

TomTom combines these sources to produce a reliable estimate.
On the device and the Traffic website, the speed at which every traffic jam is moving is indicated by a colour. The table below shows which colour represents each traffic estimation.

 HDTraffic_delays.jpg ( 23.1K ) Number of downloads: 5




Traffic incident symbols

Traffic incidents are displayed as small symbols on the Driving View and the HD Traffic sidebar. There are two type of symbols:
• Symbols shown in a red square are incidents that HD Traffic can help you to avoid.
• Symbols shown in a red triangle are weather related and are for information only. You cannot use HD Traffic to avoid them.

 HDTraffic_symbols.jpg ( 32.56K ) Number of downloads: 4