1. A method comprising: generating, with a processor, a two-dimensional map from a perspective view, the perspective view being at an angle, which is not a normal to the map, looking down on the two-dimensional map; identifying at least one road or pathway represented on the two-dimensional map; obtaining traffic flow information for a plurality of locations along the at least one road or pathway; projecting, along a third dimension, a line on the two-dimensional map, the line being above the road or pathway from the perspective view, a height of the line being a function of the traffic flow information for the locations such that the height for a first of the locations is greater than for a second of the locations; and displaying the map with the line.