ARLA/CLUSTER: GPS versus Radar.

ct1hix sapo.pt ct1hix sapo.pt
Quarta-Feira, 7 de Novembro de 2007 - 21:33:08 WET


Como normalmente  ando banstante abaixo do limite não tenho essa  
preocupação...

73 CT1HIX Gomes


Citando João Gonçalves Costa <joao.a.costa  ctt.pt>:

> Os pais de um jovem condutor norte-americano depois de sofrerem  
> várias multas por excesso de velocidade praticadas pelo seu filho  
> resolveram meter a policia em tribunal contentando o excesso de  
> velocidade  no Radar com os dados contraditórios registados no seu  
> GPS, solicitando que o tribunal ateste qual é o sistema com maior  
> precisão. Independentemente desta questão, quantos radares usados  
> pela policia e existentes nas estradas são devidamente calibrados e  
> aferidos periodicamente..? Será que não poderemos usar um sistema de  
> APRS para contestar as multas que nos são aplicadas...?
>
> João Costa
> CT1FBF
>
> GPS vs. radar accuracy
> Stepdad is contesting a teen driver's speeding ticket.
> By Lisa Leff
>
> Associated Press
>
> WINDSOR, Calif. - Given the option of contesting a traffic ticket,  
> most motorists - 19 out of 20 by some estimates - would rather pay  
> up than pit their word against a police officer's in court.
> A retired sheriff's deputy nevertheless hopes to beat the long odds  
> of the law by setting the performance of a police officer's radar  
> gun against the accuracy of the GPS tracking device he installed in  
> his teenage stepson's car.
>
> The retired deputy, Roger Rude, readily admits his 17-year-old  
> stepson, Shaun Malone, enjoys putting the pedal to the metal. That's  
> why he and Shaun's mother insisted on installing a global  
> positioning system that monitors the location and speed of the boy's  
> Toyota Celica.
>
> Malone complained bitterly about his electronic chaperone until it  
> became his new best friend July 4, when he was pulled over and cited  
> for going 62 miles per hour in a 45-m.p.h. zone.
>
> Rude encouraged him to fight the ticket after the log he downloaded  
> using software provided by the GPS unit's Colorado-based supplier  
> showed Malone was going the speed limit within 100 feet of where a  
> Petaluma officer clocked him speeding.
>
> "I'm not trying to get a guilty kid off," Rude said. "I've always  
> had faith in our justice system. I would like to see the truth  
> prevail, and I would like Shaun to see that the system works."
>
> Although traffic courts do not routinely accept GPS readouts as  
> evidence of a vehicle's speed - and many GPS receivers aren't  
> capable of keeping records anyway - some tech-savvy drivers around  
> the world are starting to use the technology to challenge moving  
> violations, according to anecdotal accounts from defense lawyers and  
> law-enforcement officials.
>
> This summer, for instance, an Australian farmer became a hero to  
> speeders everywhere when he got a ticket dismissed after presenting  
> police with data from his tracking device.
>
> While winning a case this way is far from a sure thing,  
> GPS-generated evidence could at least inject an element of doubt  
> into typically one-sided proceedings, said Jim Baxter, president of  
> the National Motorists Association.
>
> A Sonoma County traffic commissioner is expected to rule early this  
> month whether to dismiss Malone's ticket based on Rude's written  
> argument that the motorcycle officer's radar gun was either  
> improperly calibrated or thrown off by another speeding car.
>
> "Radar is a pretty good tool, but it's not an infallible tool," said  
> Rude, who spent 31 years in law enforcement. "With the GPS tracker,  
> there is no doubt about it. There is no human interference."
>
> Rude plans to offer scientific data and experts if his challenge  
> doesn't succeed right away.
>
> Petaluma police Lt. John Edwards said he could not discuss Malone's  
> case, but disputed Rude's contention that GPS is more accurate than  
> a speed gun.
>
> "GPS works on satellite signals, so you have a delay of some type,"  
> Edwards said. "Is it a couple-second delay? A 30-second delay?  
> Because in that time, people can speed up, slow down."
>
> The device in Malone's car, originally designed for trucking  
> companies, rental-car agencies, and other businesses with fleets,  
> sends a signal every 30 seconds that records his whereabouts and  
> travel speed.
>
> His parents signed up to be automatically notified by e-mail  
> whenever he exceeded 70 m.p.h., and the one time he did, he lost his  
> driving privileges for 10 days.
>
> Rude said he was talking about the ticket - Malone has tried to stay  
> out of it - to encourage other parents to keep tabs on their teenage  
> drivers using GPS. He said he has had to tell too many parents that  
> their child was killed in a wreck.
>
> David W. Brown, a Monterey lawyer and author of Fight Your Ticket in  
> California, said attacking the reliability of radar guns does not  
> usually get speeders very far, especially if they are unwilling to  
> devote extra time and money to hiring legal experts.
>
> Still, among people who do challenge tickets, the proportion who  
> triumph is relatively large, he said. Their technique? Betting the  
> officer who cited them will be unable to make it to court.
>
> "Statistically, when people do prevail," Brown said, "that is the  
> most common method."
>
>
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