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  #31  
Old 06-19-2010, 02:47 PM
FireRanger FireRanger is offline
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Default Re: Radar Gun and GPS question

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Originally Posted by STL View Post
There was a 6 vehicles including my self. So I am guessing he was behind the other 5 vehicles as we all went through the first signal light.
AH HA! I'm not saying this is what happened, but its possible.

When the radar is in a moving mode, it basically assumes the most significant object it sees is the earth. It registers this speed as the patrol car's speed. At the same time, it gets radar returns from the other vehicles in front of it ("Targets"). Usually you can tell it to lock on the strongest or the fastest target. Strongest is usually the closest. Fastest is obviously the fastest but could be any distance away. Clearly he had it in "Fastest Target" mode since he got you.

Remember how I said it interprets the biggest thing it sees (the earth) as stationary to determine it's own speed? Well guess what happens if it picks up a large vehicles in front of it as the earth instead? It will think it is moving slower than it really is and therefore interpret the target speed as being faster. So if the cruiser is going 30 and you're going 60 and it screws up and thinks the cruiser is only going 10, it will interpret your speed as 80 instead. This is possible however it is a rare occurrence. But given he was in bunched up traffic at a light, i wouldn't completely rule it out.

In addition, in fastest mode it is going to display the fastest target regardless of signal strength. You were far away and there was a bunch of other cars between you and his radar. This can all contribute to an inaccurate reading.
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  #32  
Old 06-19-2010, 05:30 PM
ranger5572 ranger5572 is offline
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Default Re: Radar Gun and GPS question

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Originally Posted by TurdFX4 View Post
the local cops around here are not allowed to use radar/laser, only state troopers are. The locals use stop watches and horizontal white lines that are painted on most roads. There is no way they can be accurate, if theyre even half a second off of pushing the button, it can throw your speed off if youre going the exact speed limit. 2 months ago my girlfriend got pulled over in my truck for supposedly doing 48 in a 45. I think the only reason she was pulled over was because I still had my oklahoma plate on my truck. but seriously 48 in a 45? wtf!

The majority of the local cop speeding tickets that are given out around here are fought and won
The lines on the road and stop watches are an extremely accurate way to determine speed. So extremely accurate, Newton himself could do nothing to get out of a ticket...One Caveat: The timer has to be started and stopped exactly on cue. It's a simple time/distance formula: D/T=V If they had a timer that started and stopped when the vehicle breaks the plane of a laser at the start and end points, then you'd be hard-pressed get that thrown out. Example, just for fun:

Speed limit=65mph
T=time in seconds - say it's 3.8 sec
D=Distance - we'll give it about 250 ft
V=velocity (ft/s) - which is converted to speed in mph by the simple formula V/1.466
V= in this case: (250 / 3.8) = 65.78mph
if the cop is .5 sec off that raises the speed to 75.75mph
So yeah, the white stripes and stop watches would be very easy to beat. If you see them do this, just break hard or pull over. The formula only works for constant speeds. If you alter your speed, the formula is no good. If it took you 5.2sec to travel that 250ft (48.07mph), then you're good.

No point to this, really. Just thought I'd share some useless information in case you're ever on Are you smarter than a 5th grader.
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  #33  
Old 06-19-2010, 10:30 PM
2001xlt4d 2001xlt4d is offline
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Default Re: Radar Gun and GPS question

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Originally Posted by turbo View Post
Andy -- what have you been smoking?
Nothing. apparently people are adding or modding gps's and their radios just to get out of tickets. Ive seen it before.
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ya, it can get tough to get the tool to fit in the slot,
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  #34  
Old 06-20-2010, 06:07 PM
ranger5572 ranger5572 is offline
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Default Re: Radar Gun and GPS question

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Originally Posted by FireRanger View Post
Well it says moving radar so I assumed he was in the opposite direction. So where was he? I'm assuming you didn't pass him in the left lane....
Dash-mounted radars will work for vehicles coming in the opposite direction, same direction in front of you, same direction behind you. the cop decides where the target is and tell the radar which car to read:



Am I getting too into this?...Maybe?
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  #35  
Old 06-20-2010, 10:05 PM
2001xlt4d 2001xlt4d is offline
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Default Re: Radar Gun and GPS question

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Originally Posted by ranger5572 View Post
Dash-mounted radars will work for vehicles coming in the opposite direction, same direction in front of you, same direction behind you. the cop decides where the target is and tell the radar which car to read:



Am I getting too into this?...Maybe?

nine times out of ten, you will get a certain beep if it is front and back. Also there is a led that will light up rear or front..
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Quote:
Originally Posted by surfer03133 View Post
ya, it can get tough to get the tool to fit in the slot,
Quote:
Originally Posted by 2004xlmiller View Post
drilling? id prefer not to drill down there.
EDGEMAN4.0 FOR PRESIDENT!!!!!!
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  #36  
Old 06-21-2010, 03:25 AM
FireRanger FireRanger is offline
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Default Re: Radar Gun and GPS question

Some can even display all three at once (Patrol, front target, and back target).
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  #37  
Old 06-21-2010, 03:28 AM
Coleosis Coleosis is offline
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Default Re: Radar Gun and GPS question

I got stopped because the rear radar in a cop car once...Until then, I didnt know they had that. $137 lesson learned. I saw the cop in oncomming so I slowed down, then after I was a ways passed him, I started speeding back up and he flipped a bitch and got me.
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  #38  
Old 06-21-2010, 11:02 AM
turbo turbo is offline
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Default Re: Radar Gun and GPS question

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Originally Posted by 2001xlt4d View Post
Nothing. apparently people are adding or modding gps's and their radios just to get out of tickets. Ive seen it before.
I'd be very interested in seeing such a setup.

...because, GPS works by determining how much time it takes a signal to reach a given GPS receiver from a specific satellite; once it has at least 3 "fixes" from different satellites, it can then plot your position on a map (within a margin of error)... given several subsequent such plots, the GPS unit can then determine an approximate rate of speed, based on the time difference and plotted position difference. If you start messing around with the timestamps, then you'll also be messing around with the calculation that plots the position of the GPS unit as well.

so, in short, I call shenanigans on this one. let us know when you've actually seen such a "modded" unit in person, or found some 'business' that produces functional navigation systems "modded" such as you describe.
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Last edited by turbo; 06-21-2010 at 11:07 AM.
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  #39  
Old 06-21-2010, 11:45 AM
2001xlt4d 2001xlt4d is offline
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Default Re: Radar Gun and GPS question

I have seen it. Its a software hack. I can ensure you that they can play with them in order to change them. Guys with the lifted trucks and some with the lowered cars will do that because they can say my speedo isn't calibrated for proper tire size, so i use my gps for my accurate mph. SO in case they get pulled over, they have a gps that shows that you were going lesser than actuall.
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Mods:Cb/recon third brake light/air silencer mod/new door speakers and h/u / shorty console, 245-75-16 goodyear wrangler duratracs on rock crawler rims. hellas and 03 honeycomb grille.

Quote:
Originally Posted by surfer03133 View Post
ya, it can get tough to get the tool to fit in the slot,
Quote:
Originally Posted by 2004xlmiller View Post
drilling? id prefer not to drill down there.
EDGEMAN4.0 FOR PRESIDENT!!!!!!
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  #40  
Old 06-21-2010, 01:12 PM
turbo turbo is offline
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Default Re: Radar Gun and GPS question

Quote:
Originally Posted by 2001xlt4d View Post
Guys with the lifted trucks and some with the lowered cars will do that because they can say my speedo isn't calibrated for proper tire size, so i use my gps for my accurate mph. SO in case they get pulled over, they have a gps that shows that you were going lesser than actuall.
Your GPS will show you a (fairly) accurate speed (as long as you have a reliable signal path to several satellites) regardless of tire size, wheel size, engine RPM, or anything else. There's no "hack" involved in this, other than installing a GPS system in your vehicle.

Quote:
Originally Posted by 2001xlt4d View Post
I have seen it. Its a software hack. I can ensure you that they can play with them in order to change them.
What, exactly, have you seen? A navigation system installed in a lifted or lowered truck means nothing relevant to your claim. Who are "they", and what "software hack" are they (claiming to be) performing? If you alter the NMEA timecodes in the GPS unit, you can fool the unit into displaying a different average speed between points, but you'd also be altering the actual calculation of where those points are on the map. Your assurances aside, I maintain my skepticism until you have something more substantial than your recollection to back up the claim.
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Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
Aux1 & Aux2 inputs on factory AM/FM/CD/Cassette
Door-dinger silencer button
Seamless retractable roof and passenger-side ejection seat with steering wheel mounted controls and safety interlock
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  #41  
Old 06-21-2010, 01:22 PM
FireRanger FireRanger is offline
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Default Re: Radar Gun and GPS question

Me too. I do not see how it is possible given how a GPS works. You can't just plug it into a computer and tell it to do something different. There has to be more to this story than "hacking" it.
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  #42  
Old 06-21-2010, 02:14 PM
joldtown joldtown is offline
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Default Re: Radar Gun and GPS question

5 over man, 5 over.
If I was you Myk. I'd go into court, ask to see his training ceritfication on the gun. Then show him your gun training certification, and tell him to clock the speed of the bullet as it strikes him in the forehead. JK, big time.
I've always heard that officer training laspes (with specific model), and gun calibration lapses are about the only sure fire technicalities to beat a speeding ticket.
Good luck! 5 over!
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  #43  
Old 06-21-2010, 02:59 PM
Rangerbabe06 Rangerbabe06 is offline
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Default Re: Radar Gun and GPS question

next time you get pulled over, ask the police officer to see the speed on the radar gun, 9 times out of 10, they wont give you a ticket because they lied about your speed. The police can't clear the radar gun until they have issued a warning/ticket and you or they have driven away. I don't know about where you're from, but in Indiana it's a law and they HAVE to show you. If they refuse to show you, take it to court and the judge will pretty much say fuck it.

My uncle is a state cop for Indiana, and my aunt used to be one for Indiana too. I get told things haha
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  #44  
Old 06-21-2010, 03:06 PM
FireRanger FireRanger is offline
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Default Re: Radar Gun and GPS question

Most states do not require showing you the radar or laser nor do they require you to retain the reading until leaving. And no, 9 times out of 10 they are not lying to you. The only people who think that are the people who have a speeding problem.
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  #45  
Old 06-21-2010, 03:16 PM
STL STL is offline
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Default Re: Radar Gun and GPS question

Well I went to the prosecutors office today. I presented my side of the story and I showed them my evidence. He even went out to my truck to see my GPS and the still recorded maximum speed. All he said was "that is interesting." he said he would contact me by wed.
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Last edited by STL; 06-21-2010 at 03:21 PM.
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