Abstract: A electronic license plate system having an identification device embedded in a license plate portion and electronics stored in a license plate holder ensures that the proper identification device is connected to the electronics. The identification device is constructed in a manner such that tampering with the device will render is inoperable. Also, if an improper license plate is mounted to the license plate holder of a vehicle, a security system will disable the electronics of the system or will transmit a alarm signal.

Abstract: An integrated retroreflective data communication display for visual and electromagnetic communication is described. The display may be configured as an integrated retroreflective electronic license plate, with printed visual information, similar to the information printed on traditional license plates, on retroreflective sheeting. An antenna network is integrated within the license plate for electromagnetic communication and may be connected to external electronic modules. The display may also be configured as an integrated retroreflective electronic road sign, also providing visual and electromagnetic information in a unitary structure.

Abstract: An electronic license plate architecture is described wherein a license plate portion has a conventional license plate having visual information thereon and an identification device integrated therewith. The identification device stores restricted information. A license plate holder supports the license plate portion and houses communications and signal processing electronics. An antenna may be integrated with the license plate portion or may be housed in the license plate holder.