1. A system for periodic lane marker identification comprising: at least one imager configured to capture a plurality of images exterior of a vehicle; a processor in communication with the at least one imager where the processor is configured to process at least one image such that a period of dashed lane markers in the image is calculated for tracking the vehicle within the detected dashed lane markers; and wherein the processor is operable to: identify a plurality of leading edges and trailing edges of the plurality of dashed lane markers; calculate a plurality of edge differences among the plurality of leading edges and the plurality of trailing edges; calculate the period of the dashed lane markers from the plurality of edge differences; and communicate an output based upon the detected dashed lane markers for use by the vehicle.