Imaging of gamma-ray sources enables the localization of the source within the field-of-view of the imager. Using a visible light camera to determine the relative position of vehicles with respect to the gamma-ray imager on a frame-by-frame basis, we are able to extend the use of a gamma-ray imager to moving vehicles on a roadway. The images from the gamma-ray imager are time shifted to make a unique and coherent gamma-ray image for each vehicle that passes in front of the system. We have built two gamma-ray imaging systems and are in the early testing phase of these systems. I will present an overview of the systems and some results from the testing phase.