BMW is now offering the enhanced BMW ConnectedDrive feature, RTTI (Real Time Traffic Information), on all models fitted with the BMW Professional navigation system and Bluetooth telephone preparation with telematics. A further bonus is that the driver can access the RTTI portal, to plan their journey, via the internet.
Rather than relying on radio-based TMC (Traffic Message Channel), RTTI makes use of TPEG (Transport Protocol Expert Group) and the GSM cellular network, which feeds traffic information data to the vehicle’s SIM card, providing updates every three minutes.
[Source: BMW]