View Poll Results: do you have one in your jk?
yes.
75
22.32%
no.
261
77.68%
Voters: 336. You may not vote on this poll
radar detector poll!
#31
JK Junkie
Join Date: Aug 2007
Location: Gilbert, AZ
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I have been pulled over with a radar detector twice and no ticket. While I do understand that some cops will be jerks about the radar detector. The fact is that if you are respectful and considerate of the cop, they can use judgement. And don't ever try to "talk yourself out of it"- they have heard every story possible and it is insulting to their intelligence. Better to just be respectful and friendly, and accept everything they say. They deal with pissed off assholes all day long. So when they get someone nice, they tend to be more lenient (with or without a detector).
By the way, no radar, don't speed, but on the city streets now, they use cameras that were originally for red light runners, now magically (not sure how this one got pulled on us) they can use them to catch speeding through an intersection as they have sensors to determine speed. Radar doesn't work for this method. So anyone out there where they are using cameras to take a picture of red light runners, if they havn't already, they will probably start using them to catch speeders.
#32
JK Super Freak
Join Date: Apr 2007
Location: Deptford NJ
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Vascar bs
VASCAR (Visual Average Speed Computer and Recorder) is really a stopwatch coupled with a calculator. Once a distance is entered, the operator pushes a button to start then stop the stopwatch. VASCAR displays the speed calculated from the distance entered and the time measured.
Thus, a VASCAR measurement depends on human input. Therefore, in order to make a VASCAR measurement as accurate as possible, the observer's/operator's reaction time must be as short as possible. (Reaction time is defined as "the time interval between an input signal (physiological) or a stimulus (psychophysiological) and the response elicited by the signal.)
What is considered "normal" human reaction time? First, let's take a look at the best: Drag racers. Average reaction time of (Top Fuel) drag racers at the 1997 U.S. Nationals was 0.124 ± 0.082 second. Imagine that our cop running VASCAR is a super cop, with drag racer like reaction times: What kind of error is introduced into the VASCAR speed measurement by a reaction time of 0.124 second? With the numbers testified to by our cop:
Distance
_________________ = Measured Speed
Real time ± Error
100
____________ = 60.096 feet/second (40.97 mph)
1.54 + 0.124
or
100
____________ = 70.621 feet/second (48.15 mph)
1.54 - 0.124
depending on whether the cop was 0.124 second too quick or too late.
The calculation above takes into consideration only one opportunity for error. However, the cop must not only start the VASCAR's stopwatch, but he also must stop it. Thus, he can introduce the error twice:
100
____________ = 55.928 feet/second (38.13 mph)
1.54 + 0.248
or
100
____________ = 77.399 feet/second (52.77 mph)
1.54 - 0.248
Looks like we are getting some error margin here: it is almost 15 mph. But wait a minute: the cop alleged that he clocked our man 66 mph (96.8 feet/second). If true, the elapsed time over 100 feet distance was 1.033 second. The error in speed reading introduced by human reaction time becomes even more severe:
100
_____________ = 78.064 feet/second (53.225 mph)
1.033 + 0.248
or
100
_____________ = 127.388 feet/second (86.855 mph)
1.033 - 0.248
WOW! An error margin of more than 33 mph! And remember, we assumed that the super cop in this example has reaction times similar to a drag racer!
Imagine if the cop is only human: Average adults show reaction times around 0.3 second -- it's not even worthwile to do the calculation. Obviously, we can no longer talk about accuracy and VASCAR in the same sentence. One can conclude that using VASCAR over a 100-foot distance cannot yield any accurate speed reading for the speeds alleged in our man's case. We come to this conclusion even before considering other sources of error, such as visual distortion introduced by the parallax effect.
And what about the law? This is what you find in § 3368 of Title 75 of the Pennsylvania Code:
(4) No person may be convicted upon evidence obtained through
the use of devices authorized by paragraphs (2) and (3) unless the
speed recorded is six or more miles per hour in excess of the legal
speed limit. Furthermore, no person may be convicted upon
evidence obtained through the use of devices authorized by paragraph (3)
in an area where the legal speed limit is less than 55
miles per hour if the speed recorded is less than ten miles per hour
in excess of the legal speed limit. This paragraph shall not apply
to evidence obtained through the use of devices authorized by
paragraph (3) within a school zone.
VASCAR is a device authorized by paragraph (3). Looks like even Pennsylvania lawmakers acknowledge that VASCAR is not a precise method for measuring speed.
Thus, a VASCAR measurement depends on human input. Therefore, in order to make a VASCAR measurement as accurate as possible, the observer's/operator's reaction time must be as short as possible. (Reaction time is defined as "the time interval between an input signal (physiological) or a stimulus (psychophysiological) and the response elicited by the signal.)
What is considered "normal" human reaction time? First, let's take a look at the best: Drag racers. Average reaction time of (Top Fuel) drag racers at the 1997 U.S. Nationals was 0.124 ± 0.082 second. Imagine that our cop running VASCAR is a super cop, with drag racer like reaction times: What kind of error is introduced into the VASCAR speed measurement by a reaction time of 0.124 second? With the numbers testified to by our cop:
Distance
_________________ = Measured Speed
Real time ± Error
100
____________ = 60.096 feet/second (40.97 mph)
1.54 + 0.124
or
100
____________ = 70.621 feet/second (48.15 mph)
1.54 - 0.124
depending on whether the cop was 0.124 second too quick or too late.
The calculation above takes into consideration only one opportunity for error. However, the cop must not only start the VASCAR's stopwatch, but he also must stop it. Thus, he can introduce the error twice:
100
____________ = 55.928 feet/second (38.13 mph)
1.54 + 0.248
or
100
____________ = 77.399 feet/second (52.77 mph)
1.54 - 0.248
Looks like we are getting some error margin here: it is almost 15 mph. But wait a minute: the cop alleged that he clocked our man 66 mph (96.8 feet/second). If true, the elapsed time over 100 feet distance was 1.033 second. The error in speed reading introduced by human reaction time becomes even more severe:
100
_____________ = 78.064 feet/second (53.225 mph)
1.033 + 0.248
or
100
_____________ = 127.388 feet/second (86.855 mph)
1.033 - 0.248
WOW! An error margin of more than 33 mph! And remember, we assumed that the super cop in this example has reaction times similar to a drag racer!
Imagine if the cop is only human: Average adults show reaction times around 0.3 second -- it's not even worthwile to do the calculation. Obviously, we can no longer talk about accuracy and VASCAR in the same sentence. One can conclude that using VASCAR over a 100-foot distance cannot yield any accurate speed reading for the speeds alleged in our man's case. We come to this conclusion even before considering other sources of error, such as visual distortion introduced by the parallax effect.
And what about the law? This is what you find in § 3368 of Title 75 of the Pennsylvania Code:
(4) No person may be convicted upon evidence obtained through
the use of devices authorized by paragraphs (2) and (3) unless the
speed recorded is six or more miles per hour in excess of the legal
speed limit. Furthermore, no person may be convicted upon
evidence obtained through the use of devices authorized by paragraph (3)
in an area where the legal speed limit is less than 55
miles per hour if the speed recorded is less than ten miles per hour
in excess of the legal speed limit. This paragraph shall not apply
to evidence obtained through the use of devices authorized by
paragraph (3) within a school zone.
VASCAR is a device authorized by paragraph (3). Looks like even Pennsylvania lawmakers acknowledge that VASCAR is not a precise method for measuring speed.
#35
JK Super Freak
Join Date: Apr 2007
Location: Deptford NJ
Posts: 1,121
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Hey! I didn't make this up. I just copied and pasted from a web site I found on google.
Looks impressive doesn't it?
Like I know WTF I'm talking about when it come to this s**t
Looks impressive doesn't it?
Like I know WTF I'm talking about when it come to this s**t
#36
JK Super Freak
Join Date: Sep 2007
Location: Odenville, AL
Posts: 1,884
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that's basically the point I was trying to make.....you don't have to be going 100mph to get caught, just normal driving can still get ya.
#37
JK Enthusiast
Join Date: Aug 2008
Location: Summerville, SC
Posts: 252
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My brother's patrol car has a detector Detector and a Jammer. But I agree with N2, I dont intend to speed, but I usually do 10 over and even SCHP monitors that, so I want to know when I am being "pinged."
#39
Radar detectors allow you to pay more attention to the road without one you spend lots of time staring at the speedometer. They also warn you of accidents and construction zones in some areas. I think that responsible drivers should have them.
#40
JK Freak
Join Date: Mar 2008
Location: Nanaimo, British Columbia, Canada
Posts: 919
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I've never had a detector, don't plan on it. These JKs are so bad over 120km/h that I never see the need.
Now, if I had my old man's corvette that would be a different story...or a Hemi swap...
Now, if I had my old man's corvette that would be a different story...or a Hemi swap...