TomTom NAVIGATION SYSTEM Owner's Manual page 76

Traffic sidebar colours
The traffic sidebar changes colour depending on how old the traffic information is on your
device:
Dark blue -The traffic information on your device is up to date.
Lilac -
Grey -
The traffic information on your device is updated automatically and the traffic sidebar will
normally remain dark blue.
However, it is possible that the device is unable to update traffic information, if, for example,
there is no GPRS network coverage at your location.
*GPRS: General Packet Radio Service
The traffic information on your device has not been updated for at least 10
minutes. HD Traffic still warns you about traffic incidents, but the
information is at least ten minutes old.
The traffic information on your device has not been updated for at least 15
minutes. HD Traffic will only warn you about traffic incidents once it has
been able to update this information.
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