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Speeding Tickets & Traffic Citations Discussion of appropriate procedures and guidelines to successfully fighting speeding tickets and related traffic citations.

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  #1 (permalink)   IP: 64.234.38.5
Old 2009-08-14
joshuab joshuab is offline
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Default How accurate is radar at singling out a specific vehicle at distance?

I received a ticket for speeding a few weeks back and about to go to court. The officer passed me (unmarked) and was about 250-350 yards behind me before my radar detector went off (Calibre K40). There were two vehicles directly in front of me in either lane. Can I argue he couldnĺt get an accurate aim at that distance while driving his own vehicle?

Is radar accurate at that distance to distinguish between 3 vehicles?

Thanks for any feedback!
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  #2 (permalink)   IP: 24.0.51.17
Old 2009-08-25
drkshdw983 drkshdw983 is offline
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Default Radar accuracy

Radar, by nature, is not very accurate at singling out targets. The radar signal leaving the officers gun, like every other radar signal, spreads out as it gets further from the source. Picking out a single car among a group would be difficult at best for an officer running radar. I'm not sure you could argue this in court though because you were the closest to the officer and you would have returned the signal first regardless of your speed and the speed of the other vehicles around you. If you're having trouble understanding this look up the Doppler effect. Hope this helps.
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  #3 (permalink)   IP: 216.80.149.102
Old 2009-08-27
Won Hunglo Won Hunglo is offline
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Default

Radar does not single out a car. The cop decides who's signal is being returned & makes the stop. You could have avoided this whole event. Dump your cheap detector & get one that actually works.
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  #4 (permalink)   IP: 98.167.222.48
Old 2009-09-08
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Craig Craig is offline
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Default

Even with the Calibre's dismal performance it'd probably have gone off before you met the officer, at least if he'd targeted your vehicle while approaching. But from your description he clearly used his rear antenna and popped you after you'd passed by.

Depending upon these targets' radar cross sections and the relative proximity of the three in relation to the police vehicle, yours was probably the strongest target. But you can probably answer that question better than I: was the cited speed close to what you were doing? I'd guess that it probably was.

As for questioning in court the radar's accuracy, don't waste your time unless there was obvious evidence of operator error, which doesn't appear to be the case here. And one question you may care to ask yourself: "How could I possibly have failed to react to a passing unmarked police vehicle?" From the description, you apparently continued driving in excess of the limit even after passing him, reacting only after the Calibre's belated warning.

Sorry I can't offer much hope. But you may get lucky; the officer may not appear in court.


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  #5 (permalink)   IP: 67.142.166.31
Old 2010-01-22
governor51 governor51 is offline
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Default hickory,NC rt 321 and I40

I need some help as i got a speeding ticket on route 321 near I-40 in Hickory NC. I was cited for a 72 in a 55 at 6:30pm when it was dark out and i came upon a marked car in the right shoulder of the double divided hwy parked parralel to the road. I was in the right lane and had noticed the vehicle several hundred yards in front of me. The problem i have is i was doing the 55mph as i use no radar equipment and really stick to the speed limits in this area. I used to use the 5 or 9 mph over rule but have not anymore given the recession and all. Believe me if it says 35,45,55,70 then i'm doing it. as i passed by the car me and my passengers were suprised when the police car pulled out and then pulled me over. I remained calm as i have not been pulled over in some 10yrs, been driving some 35 plus yrs now. The officer was a young short female. I provided all documents as soon as she reached my window. She said i was doing 72 in a 55. I handed her my documents and she proceded back to her car and wrote me a ticket. After coming back she explained i would need to appear as it is over 15mph in court in 2 months. What i need to know is how to find out 1) What type of radar was used as the type is not listed on the ticket and how my speed was caculated as she was looking in her rear view mirror to disern what car was speeding. It was dark out and traffic hour with aprox 2 lanes to her left and a running entrance ramp lane across a medium to her right that is straight for hundreds of yards. So the police cars radar would be picking up 3 lanes of vehicle traffic. 2) are websites such as ticket killers worth investing in.
I am unemployed and have the time to go and fight what is a unfair ticket to me. I just want to know all the angles that can be used to refute a false finding on the officers part. any help would be appreciated
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