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In some car radios you can enable/disable the 'TA' function of RDS. TA must be enabled to have any chance of traffic reports interupting Radio 4. I believe the BCC is the best radio network for the 'EON' field. I think this also needs to be enabled, if configurable, to use the 2nd tuner to search for local stations offering 'TA'. I have not looked on iDrive for the BMW options though.
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