The authors describe how international efforts to develop and refine a standard for digital road databases (termed geographic data files (GDF)) have been paralleled by efforts to use traffic messages to update GDF, typically by RDS-TMC. The integration of RDS-TMC messages with GDF requires the resolution of some fundamental issues. These problems are being approached from different directions by PROMETHEUS and a number of DRIVE projects and findings are fed directly into CEN the European standards body, for early standardisation.
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