To plagiarize one of my previous posts:
The maximum possible target range will vary from vehicle to vehicle depending on the radar cross section. For example, here's a Car & Driver test from way back in 1979(!). They used a Kustom KR-11, results are in feet.
But of course, different models etc will have different maximum ranges against the same vehicle.
A more recent study against some current guns can be found
HERE. (
It might be wise to take the absolute results in this with a grain of salt, considering who the author is.)
The target vehicle for the Stationary-Mode Maximum Range test was a Special Service Package Ford Expedition. This vehicle was otherwise used as the radar vehicle. For the Moving-Mode Maximum Range and Same Direction Maximum Range tests a Nissan Maxima was used as the target. All guns were Ka band except the Genesis II Directional which was K-Band.
To sum things up, it is generally a couple thousand feet to over a mile depending on the vehicle, the mode, and the circumstances.
On the other side of the coin, Speed measurement Labs testing has indicated that todays high-end detectors can alert to the radar at over
ten miles away from the radar source, on straight, flat, line-of-sight terrain.
So, just about any modern radar detector is technically capable of alerting to police radar at
several times the distance at which the radar gun can acquire your speed.
Now, some people might look at this info and conclude that any detector would be good enough, since it has the ability to alert farther away that the radar can acquire a speed. Nothing could be further from the truth. You just don't see such extreme straight, flat, line-of-sight, constant-on situations much in the real-world. Generally, the range is limited by terrain obstructions, aiming, instant-on, etc. Having a sensitive detector isn't about getting a three mile alert where another detector would have only given two miles. It's not about getting a 30 second alert while another detector would only provide 20 seconds. It's about getting that 1-2 bar alert over a hill, or when instant-on is being used up ahead. The point of having a sensitive detector is that there will always be situations where the more sensitive detector is capable of providing advanced warning, where a less sensitive detector would not.
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