Patent ID: 7742873
Filing Date: 2010-06-22
Classification: G01C,G08G

Abstract:
1. A navigation guidance system comprising: a road network database operable to store data defining a road network within a geographical area; a traffic database operable to store data defining speed-time characteristics for roads of the road network, which speed-time characteristics define traffic speeds along the roads in the network at different times; a receiver operable to receive data from a user defining a travel plan including a source location, a destination location and a proposed travel time; and a route calculator comprising: (i) a route determining circuit operable to determine traffic speeds for the roads of the road network in dependence upon the proposed travel time and said data defining said speed-time characteristics; and (ii) a calculating circuit operable to calculate a route from the source location to the destination location defined in the travel plan at the proposed travel time using the data defining the road network and the determined traffic speeds for the roads of the road network.