1. A computer-implemented method of displaying on a graphical map traffic flow data representing traffic conditions on a road system, the road system encompassing a predefined geographical region, the method comprising: (a) obtaining traffic flow data for the road system; (b) a user selecting an object of interest within the geographical region, the object of interest having a corresponding geographical location; and (c) creating a graphical map of at least a portion of the road system and displaying the traffic flow data on the graphical map, wherein the graphical map includes the geographical location of the user-selected object of interest.