The speed of any motor vehicle may be checked by the use of radio microwaves or other electrical device. The results of such checks shall be accepted as prima facie evidence of the speed of such motor vehicle in any court or legal proceedings where the speed of the motor vehicle is at issue. The driver of any such motor vehicle may be arrested without a warrant under this section, provided the arresting officer is in uniform or displays the officer’s badge of    authority; provided that such officer has observed the record of the speed of such motor vehicle by the radio microwaves or other electrical device, or has received a radio message from the officer who observed the speed of the motor vehicle recorded by the radio microwaves or other electrical device. Nothing herein shall affect the powers of cities or towns to adopt and use such device to measure speed.