My wife got this X-band encounter. I'm calling it instant-on, or at least it seems the officer is turning his radar on and off selectively. Maybe it is just the cresting of the hill or reflections from other cars? Anyway, it looks like the rabbit gets lit up pretty quickly.
YouTube - X band encounter (instant-on) - Escort 9500i radar detector
Note: The small skip of footage in the middle is due to my camera recording digital files in one-minute segments. After I merged the files, I realized there is a tiny gap of recorded footage with this device. I'm going to change the interval to 5 minutes I guess.