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Thread: radar clocking

  1. #1
    Experienced
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    Default radar clocking

    Does the police have to be in line with your car to clock your speed ? So if the police are at the corner of a road but he can see you coming but your not line up can he still get you. And if there is 2-3 cars in front of a cop can he clock you seed up ahead or do you have to pass by him

  2. #2
    Yoda of Radar
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    Perpendicular to the road (the device) , he cannot. Otherwise you will have a speed with cosine error in it, to varying degrees until it's at 90 degrees. Should be perfectly parallel but this is not always possible.

    I don't know if they can clock your seed though.

  3. #3
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    If someone tries clocking my seed, I'll tell them to get the hang out of the room, I'm trying to entertain a lady!

    Like what Saab said...there will be a cosign error if they're not perfectly parallel to you. Most of the newer guns can compensate for it to an extent. You cannot be clocked if the gun is perpendicular to you however.

  4. #4

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    Quote Originally Posted by Arvetus
    If someone tries clocking my seed, I'll tell them to get the hang out of the room, I'm trying to entertain a lady!

    Like what Saab said...there will be a cosign error if they're not perfectly parallel to you. Most of the newer guns can compensate for it to an extent. You cannot be clocked if the gun is perpendicular to you however.

    :wink:

  5. #5
    Old Timer
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    The cruiser can be perpendicular but the radar antenna can't be. If the cruiser is parked sideways, he's using a handheld radar or laser gun out the side window, most likely.

    Cosine error is only significant at angles more than 15-20 degrees or so. If they're that far off the road, they'll just clock you from further back to minimize the angle/cosine error.

    Cosine error is always in the driver's favor, as it results in a lower speed reading on the gun.
    If I'm passing you on the right, YOU are in the wrong lane!

    If speed kills, how come I'm still alive?

    Active Countermeasures: V1 3.858, Escort Redline, Beltronics STi-R+, LI Dual 7.1x CPU/8.7 Heads (front)
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  6. #6

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    'Cosine error is always in the driver's favor, as it results in a lower speed reading on the gun. '


    not with moving radar and a metal object like a large billboard off to the side of the road. In this case the police crusier's radar could very well assume that the police car is moving at a slower speed than it really is because of the cosign error induced from the sign and make it appear by subtracting it's own speed from the speed reading of the target car that the target car is moving much faster than it is....It's very complicated so don't ask. I believe the copar? police radar info site can explain it better than I.....

  7. #7
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    Quote Originally Posted by stalkervision
    not with moving radar and a metal object like a large billboard off to the side of the road...
    In that case the radar would show an incorrect cruiser speed. One would hope the officer would check that before pulling over a speeder with mobile radar.
    If I'm passing you on the right, YOU are in the wrong lane!

    If speed kills, how come I'm still alive?

    Active Countermeasures: V1 3.858, Escort Redline, Beltronics STi-R+, LI Dual 7.1x CPU/8.7 Heads (front)
    Other/Backup Countermeasures: V1 3.813 (loaned to friend), Beltronics Pro RX65 M4 6.3
    Vehicle: 2002 Audi A4 1.8T Quattro
    LEO Toys: Kustom Pro Laser II & III
    Encounters/Saves August 2011: Radar 3/1, Laser 0/0


  8. #8

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    Quote Originally Posted by kpatz
    Quote Originally Posted by stalkervision
    not with moving radar and a metal object like a large billboard off to the side of the road...
    In that case the radar would show an incorrect cruiser speed. One would hope the officer would check that before pulling over a speeder with mobile radar.

    well you would hope would't you but many many times not......

    the police only has his speedo to compair it to and if that is out of calibration like it often is your might well be in trouble. Even a few miles difference can be the margin between getting a ticket and not getting one...

 

 

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