Abstract: Embodiments of the present invention relate to a navigation system, comprising data storage means arranged to store at least digital map data, traffic state information, and places of interest data, and a route planning module operably coupled to the data storage means and arranged to provide access to the digital map data and calculate a route to a destination, a traffic state interrogator operably coupled to the data storage means and arranged to access said traffic state information and to determine traffic status information relevant to said calculated route to the destination, a places data interrogator operably coupled to the data storage means and arranged to access said places of interest data and to determine relevant information portions about places of interest on the calculated route dependent on the determined traffic status information, and a navigation instruction generator operably coupled to the data storage means and arranged to generate navigation instructions including the relevant informa

Abstract: Embodiments of the present invention relate to a navigation system, comprising data storage means arranged to store at least digital map data, traffic state information, and places of interest data, and a route planning module operably coupled to the data storage means and arranged to provide access to the digital map data and calculate a route to a destination, a traffic state interrogator operably coupled to the data storage means and arranged to access said traffic state information and to determine traffic status information relevant to said calculated route to the destination, a places data interrogator operably coupled to the data storage means and arranged to access said places of interest data and to determine relevant information portions about places of interest on the calculated route dependent on the determined traffic status information, and a navigation instruction generator operably coupled to the data storage means and arranged to generate navigation instructions including the relevant informa

Abstract: A navigation device has a GPRS receiver for receiving real-time information about slow traffic flow or slow average speed on a stretch of motorway, indicating congestion. The device calculates a new itinerary to avoid the congestion, based on historically recorded speeds on secondary roads weighed by the current average speed in the congestion area.

Abstract: A method of creating a speed estimation representative of vehicle speed along one or more road segments. In at least one embodiment, the method includes obtaining at least reference speed data from a reference source of data and second speed data from a second source of data, wherein the second source is different from the reference and the speed data is indicative of vehicle speed along the or each road segment; using the reference speed data to verify the second speed data and modifying the second speed data according to the verification; and generating an estimation of vehicle speed for the or each road segment based upon the verified second speed data.

Abstract: A method of providing a graphical indication of traffic congestion along a stretch of physical road notionally divided by a traffic information provider into one or more road segments is disclosed. The invention also covers a navigation system, portable navigation device, and or software capable of implementing such a method.

Abstract: A navigation device has a GPRS receiver for receiving real-time information about slow traffic flow or slow average speed on a stretch of motorway, indicating congestion. The device calculates a new itinerary to avoid the congestion, based on historically recorded speeds on secondary roads weighed by the current average speed in the congestion area.