Originally Posted by Jdub679
I have an Escort 8500. It works. I can pick up a radar (Ka) band from over a mile away, given good line of sight. But remember that radar basically works in a straight line (barring any reflections), so if you come around a corner or over a hill really fast and you didn't get a radar tone until you had line of sight with a police officer, then you're still screwed. In other words, you still need to drive smart.
That's not true, lidar is line of sight(just youtube a lidar gun in action or watch the guys of lidar videos for their explanations). Radar has a diminished functionality but still works decently well past barriers and obstacles. It measures doppler shift(based on sound waves). A great(read: expensive) radar detector will still catch radar over barriers because it will be more sensitive due to multiple antennae, angle of antennae with respect to each other, etc.
Plus, you shouldn't be speeding too much into a blind corner, they wont need radar/lidar to estimate your speed before you notice them.