Join Date: Feb 2011
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Just to clear things up - The cop was not using a radar gun. He had a radar unit mounted in his back window. Had he been using a gun he would be accurate with a proper tune of about +-1mph. The units mounted in the vehicle are accurate to a certain point. But if you are going to court to try and convince the judge that you were only speeding 10mph over the speed limit then you'll probably look like a dumbass.
(Q)What is the "Cosine Effect"?
(A)The Cosine Effect is a radar measured speed error due to the angle between the radar and target vehicle or object.
(Q)How does the Cosine Effect influence measured speed?
(A)The Cosine Effect causes a stationary radar to measure speeds low, the greater the angle the lower the measured speed. Moving mode radar may measure target speed HIGH in some situations.
(Q)Which angle is the Cosine Effect angle?
(A)The Cosine Effect angle (from the target vehicle's point of view) is the angle between the direction of the target vehicle and the radar. If the target vehicle is traveling directly toward (or away) from the radar, the Cosine Effect angle is 0 degrees (no error).
(Q)How large or small is the Cosine Effect error?
(A)The greater the angle, the greater the error. The error is a function of the cosine of the angle, thus Cosine Effect error. Measured speed = actual speed multiplied by the cosine of the angle.
2010 Tornado Red 675 - Vela
2008 Xterra OR - Jaws