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This paper presents the architecture of an Advanced Traveller Information System which disseminates RTTI through a highly interactive web interface. The presentation layer relies on Google Maps and the use of cutting-edge AJAX techniques, while the underlying core technology is the traffic aggregation server. The server applies several ad hoc algorithms to normalize each traffic data feed, both for dynamic (road congestion, road works, accidents) and static data (black spots, speed cameras, risk mapping per road stretch as provided by the EuroRAP programme). Static data is also encoded in order to be easily downloaded and displayed in most GPS units.