I was just out driving along a straight road with many dips in it. Some of the dips are deep enough for on coming traffics to be momentarily out of view. I got a local police K band alert and my bogey counter went from 1 to 2 to 3 and as the cop got closer the bogey counter went back down to 2 and finally settled on 1. There was only one radar source. Any comments or suggestions?