Tests also continued at CCETT and BBC on the CARMINAT approach, which formed the basis of an alternative ALERT B coding proposal.Ī major question addressed in the Alert A scheme was the total number of traffic event locations to be coded. CRC produced a proposal for a modified BASt/Blaupunkt single group message definition, which became known as the ALERT A coding scheme. Then, in 1987, the CEC invited Castle Rock Consultants to lead a joint team that would take TMC development a stage further. A second proposal, by Bosch-Blaupunkt and the German Road Research Institute BASt, sought to use just a single RDS Group per traffic message. Within these RDS Groups, 32 bits per group would be used for traffic data, giving a total traffic message length of 64 bits. This proposal required the use of at least two 104-bit RDS data groups for each message. Īn initial proposal for defining RDS-TMC data fields had been made to the European Conference of Ministers of Transport (ECMT) in Madrid, based on a scheme developed by CCETT and Philips in the Eureka-sponsored CARMINAT research project. The main goal of the project was to develop and build consensus upon a draft standard for broadcasting RDS-TMC traffic messages in densely coded digital form. Development ĭetailed technical proposals for an RDS-TMC broadcasting protocol were first developed in the European Community's DRIVE programme research project RDS-ALERT, a partnership of the BBC, Philips, Blaupunkt, TRRL and CCETT led by Castle Rock Consultants (CRC). The other side of the receiver is connected to a car charger via an antenna-power combination cable. A Radio Data System – Traffic Message Channel (RDS-TMC) receiver (left) attached to a TomTom navigation system via a USB cable.
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