You would think that but no. If you consider anything in front of you not moving as reason to stop, if i put you on a hill, your radar is now pointing down the slope, so as you approach the bottom your vision will tell you "im ok to proceed, its just the hill slope leveling off." Radar will tell you "oh shit theres a stationary object, brake now". Stationary objects in path is a limitation of using radar, which cant tell what the object is.