An old K-55 won't work because it will read the: "LARGEST, closest, and fastest object in that order. That is why I cannot get a "clock" on a Civic moving at 85+mph when he pulls up alongside a semi and stays there until he is out of range. The truck might be moving along at only 55+, but if the Civic times it right, and I am stationary, he's got me. Now can we keep this little secret just between us?
Besides, you will have to postion the radar behind the slide. I think a laser is the better way of the two.