Yes
Of course they can all they have to do is hold the radar gun with one hand and the wheel with the other
Nope. The radar is only a confirmation of the officer's visual estimation.
As far as I know it isn't illegal anywhere for a police officer to hide, its not considered entrapment unless you're being tricked into doing something you wouldn't normally do. So yes, they can hide while using radar.
Doppler Radar
The answer is "yes." Traffic radar monitors both the speed of the vehicle in which is it mounted and the speed of "target" vehicles coming toward or moving away from it. On the radar display, the officer sees two speeds: "patrol" (the speed of his vehicle) and "target" (the speed of the vehicle the radar is tracking). the target speed measurement is equally accurate, whether the patrol vehicle is moving or not.
Radar uses radio waves.
radar gun
No. With police officers in motion, it would appear that cars would be going slower. Say that a car is going 50 MPH, and you are going 45 MPH. Eventually the vehicle wil be ahead of you. Now say you are a police officer with radar. If you test this car, it will appear (on radar) that the 50 MPH car is only going 5 MPH, thus to get the accurate speed, you must be going 0 MPH.Disagree. The original police radar required a stationary unit. Radar is use for the past 30 years is capabable of adding or deducting the speed of the police car from the observed speed. It does not require that the police car be in one fixed spot.Added: The second cotributor is correct. I seriously doubt that any of the old radar units are still in operation much less certifiable as accurate. ALSO: the term "radar" is a commonly used by the the public to describe ALL police speed-clocking devices. Any of these can be calibrated to be used while the vehicles are in motion.
Yes, he can sit in an area that is out in the open, but not where you would expect him. The CHP have cars that from a distance you can not tell it is a police officer until they come right near you. The all white SUV's are particularly hard to tell from a distance and the radar they have on the cars can go both front and back at a long distance. Once you see one it is too late if his radar gets you.
radio waves
radio waves
Radar is used to track things, while the telescope can only magnify or see things from a far distance. Radar is visible, while a telescope is not. Telescopes are old, radar is new (: