Abstract: A method is provided for identifying whether a vehicle has entered, departed, or stayed in a target lane as opposed to an adjacent non-target lane of a segmented roadway. Signals are received from at least one signal source at a receiver within, attached to or integrated into the vehicle marking the geographic position of the vehicle at a sampling rate in a detailed travel path. At each sampled point in the travel path, the method compares the standard perpendicular distance between: the vehicle and the target lane centerline (d1); and the vehicle and the non-target lane centerline (d2); It is assessed that the vehicle is in the target lane if the distance d1 is less than the distance d2, and otherwise, it is assessed that the vehicle is in the non-target lane.