ON my way to ATL Friday night to see the Bravos-Cubbies. (15 inning sleeper that was)

It was a drive over - drive back sort of proposition.. that's why I didn't post to meet for drinks or something.

Anyway - We're on I-20 E.. Cruising at 85 on the speedo (about 78.. love those BMW speedos) Come over the hill.. 3 GSP's in the median - All clocking straight across the interstate - fooling any ones radar.. when radar isn't travelling down the interstate - how do you pick it up...

Two miles later - a county sheriff - sitting in the median clocking straight across.

Two more miles - another sheriff - clocking straight across the median.

IN all instances - My radar didn't go off until I was right on them - I saw them Before my radar went off.

They don't play fair- if the radar is going straight across the interstate- there's no way to pick it up until you are on top of it.

I didn't get pulled over or get a ticket - but still.

I will say again - GA cops don't play fair.

Lemme guess... Carroll County?

They can get nasty sometimes.

Carter

ON my way to ATL Friday night to see the Bravos-Cubbies. (15 inning sleeper that was)

It was a drive over - drive back sort of proposition.. that's why I didn't post to meet for drinks or something.

Anyway - We're on I-20 E.. Cruising at 85 on the speedo (about 78.. love those BMW speedos) Come over the hill.. 3 GSP's in the median - All clocking straight across the interstate - fooling any ones radar.. when radar isn't travelling down the interstate - how do you pick it up...

Two miles later - a county sheriff - sitting in the median clocking straight across.

Two more miles - another sheriff - clocking straight across the median.

IN all instances - My radar didn't go off until I was right on them - I saw them Before my radar went off.

They don't play fair- if the radar is going straight across the interstate- there's no way to pick it up until you are on top of it.

I didn't get pulled over or get a ticket - but still.

I will say again - GA cops don't play fair.

Please allow me to dispell a few false notions here (and believe me... I mean no malice in doing so):

1) RADAR cannot work "straight across the road" as you have stated here. If a cop were to shoot RADAR at you when you were directly beside him, his gun would register a speed of zero MPH. That is because with relation to the radar gun, your car is moving at 0 MPH.

The way RADAR, and even laser, has to work is that they get a head-on (or near head-on) sighting of your car. In other words, your movement in relation to the source gun has to be towards/away from it. As I said, they can be somewhat off-axis, but the more off-axis they sit, the closer to zero (relatively-speaking) their reading is going to be.

2) The reason that you were not getting anything on your detector until you were on top of them was because they were most-likely using the "Instant-On" feature of their guns.

If they left their guns shooting constantly, of course today's detectors would easily ferret out their signal long before you crested the hill or rounded the curve, giving you a chance to slow down and avoid a ticket. With "Instant-On," they do not transmit a signal until you're right on top of them, then BAM!! You're toast. No time to slow down.

3) In Georgia, State Troopers exclusively use LASER when doing stationary targetting of traffic. Any RADAR you would've picked up would be from a local cop up ahead or possibly from their moving RADAR unit, though I would think they'd have those turned off for stationary targetting.

At any rate, you're right -- Georgia doesn't play around, coming in at #6 on the worst states on speeding on a list I saw a few months back. I particularly hate it because of LASER, which is way harder to detect early enough than RADAR is.

I didn't know any of those things - but they make sense (mostly).

My radar detector is original to the car - it's a whistler 500 or some such low number. A completely remote unit- There's a transponder inthe front of the car behind the grill and in the rear bumper behind the rear skirt. The indicator sits right on top of the steering column.. no one sees it but me.

I'm wanting to upgrade to a V1 - but the 400 duckets or so puts a dent in suspension mods etc.

in the # 1 - I kind of understand what you are saying but would like to put this thinker out there for you to ponder:

If cop is sitting still-and I am moving - There will be a speed registered,

because I do have a speed "relative" to the radar gun..

now - how accurate that is is anyones guess - I once heard of a cop clocking a tree at 48 mph.

It was crazy - It was like 3 sets of cops in 10 miles.

Right outside Villa Rica exit was where the GSP's were - same place I got arrested (I think it was the same place) Years ago for 108 in a 65. (in My scuby GL-10 turbo)

All the same - GA cops still don't play fair.

As cheap as those seats were - we're thinking of putting together a few more road trips for some braves games later in the year.

in the # 1 - I kind of understand what you are saying but would like to put this thinker out there for you to ponder:

If cop is sitting still-and I am moving - There will be a speed registered,

because I do have a speed "relative" to the radar gun..

now - how accurate that is is anyones guess - I once heard of a cop clocking a tree at 48 mph.

Leaving the accuracy of the gun out of the equation, if a cop shoots you "straight across the road" as you are directly in front of him, I can assure you that the speed will be zero.

For confirmation, I will defer to Ryan W and Jacob -- both of whom are Mechanical Engineers from Tech (I'm Electrical). They will agree that the velocity vector relative to the RADAR gun at that moment would be zero. Now, if he shoots out his side window at the front of your car right before you get to him, that's a whole different story.

I don't mean to be argumentative at all, but rather just pointing out a few physics-based facts. :)

Go ahead and act like I'm not ME.

I was cruising at 80 mph headed East on 78 two months ago. I was almost to the East 316 exit so I backed off the throttle to about 60. As I went through the last intersection before my exit my radar detector went off. I headed down the onramp to 316 and thought nothing of it because I was only 5 over the limit. Before I got to the end of the ramp a GSP unit pulled me over. He told me that he got me going 85 mph. I told him that was impossible because I was going 60-65 when he clocked me. Of course, he refused to believe me and wrote me up for 85 in a 55. I thanked him for ruining my evening and took off down 316. I was pissed and not looking forward to defending against his BS accusations.

Just before I got to Epps Bridge Pkwy, he got on my tail and flashed his lights. I thought he was going to pull me over for absolutely nothing again. I turned left onto Jennings Mill Rd and pulled onto the grass. He came up to the car and said, “I never make mistakes, but I messed up tonight. You were telling the truth about your speed. I had my radar set to stationary, but I was moving at about 30 mph. That accounts for the difference in the speed you said you were going and the speed I clocked you at. Since you were so respectful to me back there I decided to catch back up with you and retract the ticket. Just give me back the yellow copy and don’t worry about it anymore.”

I did not expect that at all. I thought he was going to give me some other BS ticket. That’s the first and only time I have ever had a cop admit he made a mistake.

Go ahead and act like I'm not ME.

You just got done failing a physics test this week -- I'll stick with Ryan and Jacob. ;)

I did not expect that at all. I thought he was going to give me some other BS ticket. That’s the first and only time I have ever had a cop admit he made a mistake.

:eek:

If that had been me, he'd have pulled me over again and given me a ticket for insinuating that he was lying. :rolleyes:

Go ahead and act like I'm not ME.
Weren't you talking of switching to MGT just the other night?

Anyway, I'll let you guys edumacate yourselves... Read. Maybe you'll learn something! ;)

How RADAR Works (http://electronics.howstuffworks.com/radar.htm)
How Laser Speed Guns Work (http://auto.howstuffworks.com/question396.htm)
How Radar Detectors Work (http://auto.howstuffworks.com/radar-detector.htm)

:eek:

If that had been me, he'd have pulled me over again and given me a ticket for insinuating that he was lying. :rolleyes:

:lol:

I'll take the ticket for 85 in a 55 anyday, as long as stay away from me when I'm doing 140 or so.

I'll take the ticket for 85 in a 55 anyday, as long as stay away from me when I'm doing 140 or so.

Indubitably.

Go ahead and act like Ryan and Jacob have never failed a test. And I've decided to stick with ME.

Can't blame him for THINKING about changing to management. Atleast you get to see hot girls in those classes.

So you are talking relative to a flat plane? .. That makes sense.

I was looking strictly at the "relative" speeds.

Cop no move - me move - speed there.

Me understand now.. I have biology degree and my physics was taught by a man who had no better grasp on the english language than my dog.

No wait - I think my dog can understand me better than my old physics prof.

:D


I still say they don't play fair.

Case 1: Cop Shooting Radar Straight Across Road

Looking at the picture below, you can see that the velocity of the car has it going perpendicular to the path of the radar. Using either Doppler Shift calculation OR ranging techniques, this will register as zero MPH on his gun.

This is because the velocity vector, V, relative to the plane of the radar gun (which can only gather information in one dimension -- towards/away from it) is zero. The only movement of the car relative to the operation plane of the gun is side-to-side, which the gun has no concept of, due to the way it works.

Thus, it will read zero. A laser gun would do the same.

Case 2: Cop Shooting Radar Into Oncoming Traffic

Looking at the picture below, you can see that the velocity of the car has it going parallel to the path of the radar. Using either Doppler Shift calculation OR ranging techniques, this will register the actual speed of the car on his gun.

This is because the velocity vector, V, is now in the same plane as the operational plane of the gun.

Case 2: Cop Shooting Radar Into Oncoming Traffic

Looking at the picture below, you can see that the velocity of the car has it going parallel to the path of the radar. Using either Doppler Shift calculation OR ranging techniques, this will register the actual speed of the car on his gun.

This is because the velocity vector, V, is now in the same plane as the operational plane of the gun.

Is that box Cosmos? I think it is! j/k, I guess it would have to be Jet Black. ;)

I think you've got it Aaron. Next lesson: How Stealth Technology Works (http://people.howstuffworks.com/question69.htm) :D

Your mom uses a Doppler Shift...:rofl:

There are numerous techniques that could be employed to aid in the fight against traffic control technology:

- Radar/Laser Detection
- Radar Jamming (HIGHLY illegal everywhere)
- Laser Jamming (completely legal, except in some states... GA is fine)
- Flat-black radar-absorbing paint (not obtained very easily and possibly illegal)
- Anti-radar shape (low frontal area of vehicle and wierd angles)
- Diffraction gratings over vertical surfaces to scatter laser pulses
- Hideway headlights like C5 Corvettes (headlights make wonderful parabolic reflectors)
- Police scanner (nothing beats knowing where the po-po is)

How do you know that my mom uses Dop... Hey wait that was towards Ron.. Never mind.. ;)

:lol:

There are numerous techniques that could be employed to aid in the fight against traffic control technology:

- Radar/Laser Detection
- Radar Jamming (HIGHLY illegal everywhere)
- Laser Jamming (completely legal, except in some states... GA is fine)
- Flat-black radar-absorbing paint (not obtained very easily and possibly illegal)
- Anti-radar shape (low frontal area of vehicle and wierd angles)
- Diffraction gratings over vertical surfaces to scatter laser pulses
- Hideway headlights like C5 Corvettes (headlights make wonderful parabolic reflectors)
- Police scanner (nothing beats knowing where the po-po is)
Now you're thinking. You must have read the article on stealth technology!

While I did read the article in question, all that info was stuff already floating around in my head. How could I NOT already have those things in mind, considering my track record with traffic enforcement.

Long have I been familiar with the exactitudes of the stealth technology world.

http://f1.offtopic.com/uploads/files/missilesgowoowoo.jpg

Cross-poster...

You stole that from a thread this morning.:nono

thats funny!

Cross-poster...

You stole that from a thread this morning.:nono
My friend sent it to me in an IM actually. This morning I was busy studying for a test this afternoon.... but call me what you will. :(

Bub-Rubb in the F-117A - that's funny as all hell. :lol:

Ron - I got it after the first question/explanation, but thanks for the illustrations, they work well to illustrate the point. (good physics drawings too - very versatile.. almost look like they came out of my ohanian book.)

I'm guessing the coppers were radaring as we came up on them. Either way - no ticket for me..

Oh, the drawings were more for the benefit of everyone else, I suppose. I saw that you had grasped the concept I was trying to get across. :)

Well - computer graphics programs might as well be written in chinese for all the good they do me. So I was quite impressed with your artistic-ness (is that a word?) Perhaps Artistic ability-

I have found that in metro Atlanta your main concern should be Laser. I have been using the Lidatek LE-20 with great success. It allows you about 5 seconds once you get tagged with a Laser gun to reduce your speed before the Laser gun registers a reading.

BTW, I now have a Lidatek LE-30 on order through a group buy which is supposed to be even better than my current unit. I love watching the cop's expression when they tag me and fail to get a reading.

The group buy is on the M5board.com. Here is a link to the group buy thread:
http://www.m5board.com/vbulletin/showthread.php?t=37470

In much of GA, your main concern should be Laser, since GSP uses that exclusively for stationary tagging.

The Lidatek and Escort ZR-3 Shifter are the two best anti-laser defense units on the market. Do NOT buy anything from Rocky Mtn. Their products are crap, according to independent studies.

! If I get clocked by a Barrow County officer and immediately pass into Oconee county, can he follow me into Oconee county and issue me a ticket?