Over 100,000 people blindly pay their speeding tickets every day... like "good sheep". That's about 4 tickets paid every second (8 hours a day)...
$baahh, $baahh, $baahh, $baahh... 
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How Radar Detectors Work
Nobody likes speeding tickets. The fines, the increased insurance premium, and the points on the license make police cars a much-feared sight. In spite of this, very few people dont speed.
To understand radar detectors, what theyre detecting has to be understood, first. Radar guns are basically radio transmitters and receivers. The radio waves frequency changes when it hits a moving car, and the amount of change to the radio wave is consistent with the cars speed: the faster the car, the greater the change to the radio wave. The radar gun converts the change to a relative speed: the difference between the police officers speed and the targets speed. (Notice that if the police officer isnt moving, his speed is 0 mph, so the speed revealed by radar equals the targets speed and no math is needed.)
Police also use lidar, which uses the same principles as radar with infrared laser bursts instead of radio waves. This circumvents radar detectors and is highly focused. You almost have to be the target to detect it, in which case youre already caught. Though it can be used like the old radar, lidar is more common where the ticketing system is automated, where the detection of a speeding car activates a camera to catch the cars license plate, and a ticket is mailed to the offender.
Radar can be easily detected with a radio receiver comparable to your AM/FM radio but set to the frequency range used for radar. (Other frequency ranges happen to be full of such things as television broadcasts and distance automatic car openers.)
However, such a basic radar detector means that if you happen to be the first target when the police officer activates his or her radar gun, youre caught by the time the detector tells you about it. Its passive, alerting you to the use of radar in the area and nothing more. This is often enough, since radar spreads so much that youll usually detect it before youre the target. Lidar, by contrast, is highly focused, so youll probably be the target before you detect it. (A black car--which absorbs more light--and plastic covers for your license plate can decrease the lidar ability to detect you while not harming your detector range, which may give you enough time to slow down before your speed is detected.)
Active detectors jam the speed readings, interfering with the signal that reveals your speed. Radar jammers and lidar jammers exist, though the police are continuously advancing the technology to detect speeders. Any jammer can become obsolete at the turn of a hat, making the investment of a few hundred dollars abruptly worthless.
Warning: radar detectors themselves give off telltale radio frequencies that are detectable with a VG2 device. Radar and lidar detectors are illegal in some areas, making their owners liable to prosecution.
The ultimate way to avoid speeding tickets is simple and widely known: dont speed. But how many drivers actually follow that method?
Speeding Drivers Guide is a directory site that provides comprehensive resources on Radar/Laser Detectors, speed trap locations and how to fight a speeding ticket.
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