Curious about Police Radar - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 17 (permalink) Old 07-10-2010, 10:47 PM Thread Starter
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Curious about Police Radar

...and before you ask, no I don't speed all that much.

Rode the bike to work tonight, and about 1/2 way there, noticed a cop sitting o the side of the road, running radar, pointing the radar gun at oncoming vehicles.

From what I could tell, he tried pointing it at me ('89 VN750, currently no windshield on it) and then just kinda set it down with a disgusted look on his face as I rode on past.

Made me wonder...can those things actually get a hit off of a rider on a bike like we ride?

Do we have enough surface to bounce a radar or laser signal off of?

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post #2 of 17 (permalink) Old 07-10-2010, 11:13 PM
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the radar guns that cops use are pretty similar to what my baseball team used in high school. if they could clock a baseball, i am pretty sure they can clock a motorcycle. don't quote me on that though, i am not an expert. just a guess...
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post #3 of 17 (permalink) Old 07-10-2010, 11:32 PM
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Quote:
Originally Posted by asbrand View Post
...and before you ask, no I don't speed all that much.

Rode the bike to work tonight, and about 1/2 way there, noticed a cop sitting o the side of the road, running radar, pointing the radar gun at oncoming vehicles.

From what I could tell, he tried pointing it at me ('89 VN750, currently no windshield on it) and then just kinda set it down with a disgusted look on his face as I rode on past.

Made me wonder...can those things actually get a hit off of a rider on a bike like we ride?

Do we have enough surface to bounce a radar or laser signal off of?
Yes ,but I think you have to be the biggest moving target in the area or they can't determine if it is you or an adjacent car ,just what I have heard.Oh yeah did you all see the news out of Ohio this week,A judge ruled that the police officers trained in radar had the right to ticket you without the radar gun because their training was good enough for them to be within a 4mph window,once again second hand info,maybe some of you buckeyes can set me straight on this,true or not?




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post #4 of 17 (permalink) Old 07-10-2010, 11:42 PM
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I will tell you by experience that Radar does work on the 750.

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post #5 of 17 (permalink) Old 07-10-2010, 11:48 PM
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Quote:
Originally Posted by asbrand View Post
...
Made me wonder...can those things actually get a hit off of a rider on a bike like we ride?

Do we have enough surface to bounce a radar or laser signal off of?
Conventional microwave radar can pick up a motorcycle, but only at much closer range.... you should be able to spot him before he gets a good signal off you.
BUT, they are trained to judge speed by observation and use the radar gun as verification of how fast they think you are going. As far as picking you out of a group of vehicles....they can see what cars are doing relative to each other and can compare that to the radar gun readout to deduce who is going at whatever speed.
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post #6 of 17 (permalink) Old 07-29-2010, 04:52 PM
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Also from experience:

They aim for your headlight (a good way to reflect light) with their laser guns.

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post #7 of 17 (permalink) Old 07-29-2010, 07:22 PM
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I've heard that bit about the cops judgment. I think it's crappy & could probably be fough in court but who goes through that much trouble. I heard it came from the supreme court.
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post #8 of 17 (permalink) Old 07-29-2010, 11:15 PM
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All radar and laser speed devices do work on motorcycles. But, it is not totally accurate, and operator error will make it more inaccurate. Radar can be made more accurate than it is, believe it or not, when they clock the speed of a baseball in a major league game, they try a lot harder to get it right than the cops do.

I have worked for the City of Chandler for 34 years, know a number of cops, and they explained it to me. Because of the error inherent in radar and laser systems, they set the speed at which they will stop you several MPH above the speed limit. A good estimate from the cops themselves however, is that only about 70% of those ticketed for speeding by the use of radar are actually guilty.

As for just how sensitive radar is, I can tell you that a person on a bicycle will trip the "photo radar" vans they set up along the streets. I've done it. Jerry.

I am a motorcyclist, NOT a biker.


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post #9 of 17 (permalink) Old 07-29-2010, 11:37 PM
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There's a radar trailer I go by with some regularity. I don't discern a lot of difference between how it picks up my VN750 vs. my cages.
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post #10 of 17 (permalink) Old 07-30-2010, 09:54 AM
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I know for a fact that in Philly they use LIDAR. Its extremely accurate even at long distances and can certainly pick up motorcycles. I got pulled over in the Jeep a while ago for speeding and the cop told me that's what they use. Here's a link to what it actually does:

http://en.wikipedia.org/wiki/LIDAR
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