Snagged :-)

SoonerLS said:
The "cosine effect" will come into play whenever the officer is shooting at an angle other than directly head-on or tail-on. The greater the angle, the lower the speed reading, until you reach 90* (ie, perpendicular to the direction of travel), when the speed reading drops to 0. (You can thank physics and vectors for that.)

Note that this is the angle of the radar beam to the target, not the angle of the police vehicle. Depending on how the radar is mounted, the car can be parked in any of several directions and still get a head-on or tail-on reading.
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This is absolutely correct. Many guys use "mounted" radar units but can still swivel the radar antenna to point wherever they want.
 
06AtlantaLS said:
You are absolutely incorrect on both points. I'm a police officer also who happens to be RADAR and LIDAR (laser) certified. Radar always tracks the patrol units speed and calculates the speed of the violator, makes its calculations and displays the "target" vehciles speed...not just the difference. Your remark about sitting diagonal is WRONG. Either parallel to traffic or perpendicular (if stationary) is best. When you are diagonal you create a cosine effect and the radar reading starts to get thrown off.

As for "tag teaming" as you called it you can definitely cite a speeder based on another officer's detection. As someone said earlier it's done all the time by aircraft or by using 1 officer stationary and calling way ahead to mobile units to make the stop. Check with the Supreme Court...any officer can take enforcement actions on a person based on information provided by a fellow officer.

Having a retired cop as your daddy is not a substitute for doing your homework and knowing this stuff first hand.
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+1 +1 +1

I am also certified in both radar and lidar and second everything said here. Sitting at an angle while running radar is OK as long as you are close to the road and your radar is facing the direction of traffic flow. The further you get away from the road, the higher the cosine angle error gets. Thats what I always understood. Cosine angle error is so slight that you would have to be way off the road for it to even have any kind of real effect though.
 
I hate when somebody posts total nonsense like this. Everythings got to be a big scheme or something. First off, your a little bitch for not being a man and accepting your deserved ticket, i guess you feel good about yourself that you get to cry to your daddy when you do something wrong, but whatever it'll catch up to you. Second, you've never sat behind the wheel of a patrol car to know how everything works so you know nothing and sound dumb. Third, you seem to think that where you live and your daddy's way of doing things isnt how others do things also. Every state, county, city has different laws and statutes. Dont act like you know everything. This post has made you look very dumb.
 
my previous post was all taken from mike valentine's website that was simple enough...everything in quotes....so you guys can go argue that with him not me i really dont care.

i dont give a damn if i deserve a ticket or not, im sure EVERYONE in here is a law abiding citizen right? if karma someday bites us all in the ass im sure im not the only one on here the karma fairy is visiting.

i dont care if anyone believes me or not because hey guess what that same night i was anal probed by aliens and i got my LS to go so fast it took flight
then i had few beers with santa.

with how much cynicism and skepticism that goes on this website we might as well change it to a forum about UFO sightings. if your a cop thats great much respect for you im going to school right now for criminal justice so i can be one. and yes i have an immediate family member who was upper management of a police force so i think he would know what equipment is used by the state police since he bought it. the seldom used now X band radars since everyone is using ka and lidar.id trust him over anyone else on this "forum".

i also know for a fact of the 18million tickets issued in the US every year....15 million can easily be thrown out on a technicality. this being one of them, people just either cant afford to or dont feel like fighting them. so you can sit on your power trip because your certified to use radar and lidar but id hardly consider you or myself an expert even my father but i know enough so that i wont let some douche cop having a bad day walk all over my ass. if he wanted to arrest me for the unregistered Abrams tank i was towing around that night, id have not resisted at all

and no, no radar gun can pick up a car if it is directly perpendicular to it, its physically impossible thats why you if your radar is mounted you swivel it or your car, no mattar what it must be diagonal or straight on.....again read my whole post

sorry i had a good day and wanted to share maybe ill get a summons from the internet police for that...you people treat this forum like its a joke that its your way or the highway, whatever you have is best, whatever you say goes. 75% of what i read on here is negative or bashing someone in some way.
 
Was anyone else as confused by this last post as I was??? WTF??

Well, for starters if you want to be a police officer, you really need to work on your spelling, grammar, and sentence structure. Report writing is a big part of the job. Maybe your "daddy" can give you some lessons. He seems to know everything else.

Hope you had fun with your alien anal probe. After reading your previous posts I see why you are their prime candidate.
 
glanga said:
and no, no radar gun can pick up a car if it is directly perpendicular to it, its physically impossible thats why you if your radar is mounted you swivel it or your car, no mattar what it must be diagonal or straight on.....again read my whole post
Click to expand...

Is that why airplanes don't track when they are tangential to the antenna??

Oh yea, they do, and have for over 30 years! And yes, it is the same principle.
 
Speed radar ONLY measures line-of-sight speed. If a speed gun was on a side street and aimed at the side of your car AS YOU PASS across in front of it, a very low reading would be registered, no matter how fast you were going. This is called the PARALLAX effect. An accurate measure of your speed can ONLY be attained from directly in front of or directly behind your car. From any other direction, the reading is actually LOWER than your actual speed (by the cosine of the angle from the path of your car). Some Police don't understand this effect. Generally, when Police wait in their parked car along a highway, they are NEARLY in front of your car, and get NEARLY your full speed. (The cosine of that angle is about 0.99, so the radar gun would record 99% of your actual speed, which is pretty close.)

Aircracft actually the VASCAR method not radar to measure your speed. id love to see any fixed wing aircraft fly directly above traffic doing 125+ or even a helicopter and measure speed with a radar from that far.
 
Dude, give it up. :lol:

You're losing this argument.

And yes, airplanes CAN get accurate speed readings. Ofcourse, you're looking at several million dollars worth of RADAR gear, but it's doable. Ever see the radar system on a jet fighter? :p
 
ok then show me a police force that'll spend several million on a single radar.

i know they get accurate speed reading......through time/distance not through radar
 
whatever to each his own, dont beleive me i dont really care

if its so stupid why argue with me......just ignore me and stop posting
 
From what I have always understood, as far as airplanes go here in Ohio, they don't use radar. They use tic marks pained along the highway and time you from one tic mark to another. You see the tic marks all the time on the outside of 4 lane state highways. They are about a foot wide and 2 feet long.

I have been given a ticket for speeding by a Road Nazi traveling in the opposite direction as well.
 
This thread is pretty amusing. It seems one of these comes around every now and then. After reading everything so far this guys posts explain alot. He's in school and sounds like he's reading right from a text book. I bet he just took a class in which this kind of thing was discussed. One thing he has yet to learn is what you study and get tested on in school is not exactly the way things are once your on the job.
I have a great suggestion for you. Forget about what uncle bob or dad the former captian tells you, go down to your local traffic court someday and listen in on what goes on. See and hear what flies and what doesnt. Its almost entertaining all the stories you'll hear. See how the traffic judges handle things and how effective an attorney is. Have you sat thru traffic court before? If you havent, go take a little field trip to see how things are enforced in your city, its free education. Getting opinions and facts from people in other jurisdictions does you no good because its different everywhere you go. One thing i have learned from traffic judges is that they dont care to spend alot of time on whether the law is wrong or not clear or whatever. If you start going that route they tell you to go contact your Governor or Senators. They are the ones that make and change the law, not the traffic judge. Same thing if you argue about a street sign or something along that matter, go tell your story to the city council. Like i said, go visit your local traffic court and check things out.
 
hey thanks for the life lesson, can you just issue me a diploma since i guess i just graduated from the school of fla02ls. i hope its accredited in the "real world!!!!"

sorry i dont waste my time typing proper english on a forum
 
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