As you approach a curve on Rt. I180 S or New Rt. 15 S there is a speed limit posted at 45 miles per hour, marked so due to several accidents of large trucks on that curve, I 180 or Rt 15 S intersects into Rt 220 S. Police lay in wait at the end of the curve where they cannot be seen, on the grass off the highway, too late for anyone to make any adjustment in speed. Within 50 ft, there is a 55 mile an hr limit posted.