Beat the traffic! Part two: TMC on test

The Traffic Message Channel runs over the FM radio frequencies and needs a compatible receiver attached to your GPS device (and is seen on devices such as the Garmin nuvi range) in order to be accessed. It delivers results not in real-time but at regular intervals.

The most appealing factor is the fact that it’s free – or at least appears to be free, since if you buy a PND with TMC traffic support the cost of a lifetime subscription to the service will be included. However, the subscription – it should be noted – is not transferable across devices.

The least appealing thing about TMC is that it tends to be quite bulky, with receivers not built in to devices but added externally, and that it needs to be powered separately. This can result in additional cabling from the device to the cigarette charger in your car, and probably even an extra wire stuck somewhere in your windscreen.

Performance is usually excellent when there is good coverage, but that coverage can be patchy. Data comes from one of two sources via traffic cameras and sensors located throughout the country and might be limited to motorways and major routes.

It’s usually accurate although it is the nature of the system that you can travel for miles with no alerts then suddenly get lots within a short distance of each other.

Pros:
Free, or perceived to be free
Excellent coverage on main roads
Hassle-free service

Cons:
Requires external power
Coverage can be patchy in some areas

Ease of use: 5/5
Accuracy: 4/5
Value: 5/5

Read Part one: HD Traffic

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