speeding ticket dismissed!
I'm still pretty new to the forum. I've been browsing for quite a while, but I haven't posted anything before. Anyways, I went to court today to dispute a speeding ticket. Well, I got lucky and they dismissed my case. It turns out the cop had no evidence to present.
For those who are interested here's how I got the ticket: I was going down Brunette Ave and I got stuck behind a truck moving extremely slow, so I speed up past him but little did I know there was a speed trap set up ahead. Keep in mind that I was looking out for my own safety by speeding up - big truck = hard to see. Anyways, I got pulled over and fined $115 or something like that. I can't remember. Well, I learned my lesson.
There's just one thing I need to know. If a cop is on a side street can he use a radar gun to measure your speed as you pass by? (basically the gun is pointed at the side of your car) and does a radar gun work when you're moving away from the radar? (so if you pass a cop can he use radar if you're moving farther away from him) Any input would be great. Thanks!
Radar will measure your speed from the front, the side, or from the rear. Now whether it gives an accurate reading of speed is another issue. Obviously when you are abeam the gun, your speed relative to the gun will be zero, and the radar gun will be zero. On a side street, the speed being read will be less than your actual speed since at an angle the measured speed is related by the cosine of the angle at which the beam intersects you from the direction in which you are travelling, multiplied by your actual speed. Basically, unless the police officer is standing dirrectly in your path or dirrectly behind your path, the measured speed will always be less than your actual speed, hence this is an absolutely useless fact in the dispute of a ticket
Gear Driven Cams
Radar will measure the speed of an object that's moving along the axis of the radar gun. Radar pulses go out, and come back, along that line. If an object is travelling perpendicular to that line, the reading will be zero... So a cop sitting in an alley can't ready your speed as you "flash" by the end of the alley. But he can get you both coming and going.
Originally Posted by silent assassin
But, he can be standing well off to the side of the road and still get a reading. For example, if he's about 20 degrees off the axis of the road, his reading will only be in error by about 5% (cos(20 is about 0.95, or the gun will read 0.95x your speed). Something to note is that if the angle increases to 30 degrees, the error goes to about 15%. So if you want to try and give yourself an extra 10% of buffer, plan to make a lane change away from the cop as he's reading your speed. It'll also put you further away from him and get you ready for the escape... 8-)