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Comments

theautoprophet

In theory, moving radar should be pretty accurate. There won't be much doppler effect, since the radar is very high frequency compared to the closing speeds of cars. The police car's vehicle speed signal may be a little off, depending on tire wear and other factors.

I would expect that taking readings at an angle would give an under-measured speed (error in favor of speeder), based on V_actual = V_measured/cos(theta)... but maybe police radars have some kind of compensation built in?

Mr. T

In relation to head-on police radar: Would the fact that the emitter vehicle (the police car) is accelerating at the moment the radar acquires a target, then continues to accelerate until the moment the radar assigns a "last hit" prior to calculating speed, have any effect on the calculated speed itself? This is supposing the emmiter vehicle does not have a interface between it's speedometer and the radar unit, and the radar unit is obtaining the emitter vehicle's speed from external sources.

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BJV

I just received a speeding ticket using moving radar that was issued for 70 in a 55. I don't believe I got up to 70 when I was accelerating to merge into traffic as the police officer was behind me. Once I was in traffic I noticed my speed was 63-64 (which I guess is still technically speeding). Is there any way to challenge this in court successfully? Thanks in advance.

BJV

I just received a speeding ticket using moving radar that was issued for 70 in a 55. I don't believe I got up to 70 when I was accelerating to merge into traffic as the police officer was behind me. Once I was in traffic I noticed my speed was 63-64 (which I guess is still technically speeding). Is there any way to challenge this in court successfully? Thanks in advance.

BJV

I just received a speeding ticket using moving radar that was issued for 70 in a 55. I don't believe I got up to 70 when I was accelerating to merge into traffic as the police officer was behind me. Once I was in traffic I noticed my speed was 63-64 (which I guess is still technically speeding). Is there any way to challenge this in court successfully? Thanks in advance.

BJV

I just received a speeding ticket using moving radar that was issued for 70 in a 55. I don't believe I got up to 70 when I was accelerating to merge into traffic as the police officer was behind me. Once I was in traffic I noticed my speed was 63-64 (which I guess is still technically speeding). Is there any way to challenge this in court successfully? Thanks in advance.

alphabyts

I've received a ticket on a quiet country route late at night, light traffic. The cop car was oncoming, behind another vehicle. He ticketed me for 72 (my cruise was set at 65 in a 55 mph zone). I'm upset because this is on top of a ticket I received a couple months ago (after 20 years of clean driving I get 2 tickets!) doing 44 2/10 of a mile before the 55 mph zone began. I hate small towns. Can he get an accurate speed with a car in front of him? He had just come over a slight rise, also.

RH

Moving radar is very accurate. Even if there is a vehicle in front of the police car. Most agencies that allow the use of them require that they be tested in the beginning of every shift. I test mine with tuning forks that came with the unit to ensure they are accurate.

The radars don't point directly in front of the patrol car. Instead they point slightly to the left of the car (I forget the exact angle it is supposed to be). Usually they are adjusted so they can track oncoming traffic from 1500 to 3000 feet away. Most of the tickets I write people say they looked at their speed when they saw me. I measured their speed a half mile away and waited for them to close in on me.

As for getting out of tickets it really depends on how much you want to get out of it. Good lawyer, have your speedometer calibrated, or the local judge might be nice to you. Either way it's usually best to admit that you were speeding and pay the fine.

Traffic Ticket Help

Radar technology is pretty acurate I thought. Assuming the physics behind it.

megan

Can a police officer get an accurate reading when he was in front of me and I was quite a distance behind him? He claims I was going faster then I think I was going!

ryan

Police officers are full of shit. I got a ticket going 54 in a 40 while i was boxed in, going the same speed as everyone else, and the ENTIRE time i would have been in sight of the cop there was a car DIRECTLY inbetween us.

LawEnforcementIsOnlyForMoney

Just another way to legally rob law abiding citizens. Law Enforcement in America is a joke.

Not once have I ever been the beneficiary of good police work.

tom jones

Cops are full of shit, my son is a cop and he's so ashamed of the prevailing attitude now he transferred to search and rescue to get away from it.

devin

i actually am reading up on moving radar because i chose to dispute my ticket and must appear when the court opens tomorrow morning. the pig bastard came to my wind and said "in a hurry somewhere? i got you goin' um, 89 90" this is in a 65 zone mind you, up the steepest mountain in the area (thew range from top to bottom is about 3/4 of a mile above sealevel) he was on the other side of the highway, traveling down the mountain "just cruizing along" at a wopping 60 miles an hour. i'm telling you now, it is a feet to travel even at 70 down that mountain and it requires you to ride your breaks the whole way down. considering he argued with me for 15 minutes about seeing the radar(since he estimated my speed when we spoke), where i live it is my right to see the radar or he gets to keep his ticket, i'm going my happy ass to court and suggesting that the at least adjust the ticket from the 89 the radar said to the 75- 80 i was actually going, and fallowing the guy in front of me. the combined velocety of our vehicles was 149, if he was going the "cruising" speed of 70, my speed could be no faster than 79. which is entirely possible, but the attitude i receaved from the cop warrents that they drop the ticket completely, especially since it is my first.

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honestly I don't like the police but this article is very interesting and useful.

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If only the 350 cities and towns could find the same political will. We can break the back of the police unions here, if people don't chicken out.

Shark

A thoughtful insight and ideas I will use on my website. You’ve obviously spent a lot of time on this. Well done!

George

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