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- Newsgroups: misc.consumers
- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!rpi!scott.skidmore.edu!jreiser
- From: jreiser@scott.skidmore.edu (Jason Reiser... Asleep)
- Subject: Re: CHP can't use radar?(Was: What radar d
- Message-ID: <1992Dec21.092328.1683@scott.skidmore.edu>
- Organization: Skidmore College, Saratoga Springs NY
- References: <1992Dec19.114320.10336@u.washington.edu>
- Date: Mon, 21 Dec 1992 09:23:28 GMT
- Lines: 67
-
- tzs@stein.u.washington.edu (Tim Smith) writes:
- > lstowell@pyrnova.pyramid.com (Lon Stowell) writes:
- > > They are also technically ignorant of how small aircraft measure
- > > their own speed...and how difficult it is to pace an auto from
- > > the air. Also they are ignorant of the difference between air
- > > speed and ground speed...and how impossible it is to measure
- > > ground speed unless you know the exact winds aloft at your
- > > altitude at the specific time of the flight.
- >
- > Here's how the cops claim they do it:
- >
- > They measure how long it takes the aircraft to go between the
- > markers, while they observe the car.
-
- Here we go again Leo!
-
- > From this, they determine the aircraft ground speed (65 MPH in
- > the case I was reading).
- >
- > They note that they are going the same speed as the car, hence
- > the car is speeding.
- >
- > The court says (I use the singular rather than the plural, because I could
- > only find one California appellate case where someone objected to this on
- > the basis of it being a speed trap) that this is NOT a speed trap, because
- > the aircraft is using the marker to measure its own speed, rather than
- > using them to measure the speed of the car.
-
- Well, I'll give this method credit as being the most outrageous way of
- nabbing a speeder that I have heard to date. Besides the fact that
- its primary purpose is to use a loophole in the law, it isn't really a
- possibility. Sure, a plane could time itself between those two
- points, but consider each of the following problems... First, you
- would have to assume that the plane is able to "pace" the car for some
- set and marked distance... not an easy feat at any considerable
- altitude; Hell, it's hard enough to do right when behind the target
- vehicle. Next, we are assuming that the plane is travelling in a
- directional vector that is equal to that of the car, right? If the
- plane changes altitude, it increases the distance between the two
- points on the ground which it is above, thereby altering the
- calculated speed. If the plane wanders at all, the same problem
- exists. Finally, we also have to assume that someone in the plane can
- accurately calculate when they are directly one line and then the
- other... I don't know how high these guys fly, but I seriously doubt
- that is possible!
- Oh yeah, I almost forgot to add this. Keep in mind that
- planes and boats rarely travel in a direction vector equal to their
- destination. If there is a wind coming from the left to right side of
- the plane, it is effectively travelling a longer distance to stay on
- course (above the road in the case mentioned) and thereby travels a
- longer distance. Yes, I do realize that this would calculate a
- vehicle's speed as lower than actual, but it isn't really relevent.
- If the evidence obtained has no direct correlation with the
- defendant's vehicle, it should not be considered... sure, some judges
- might hear it, but it still is garbage.
- So now, are you sure that the CHP actually use such a method?
- Seems to me that any reasonable presentable and intelligent person
- could take such a case to court and put the Police Department to
- shame. Maybe you should check the facts again, or be happy that you
- know that you'll get off if stopped this way.
-
- - Jason
- --
- ---------------------------------------------------------------
- \ Jason A. Reiser \ Send E-Mail to jreiser@scott.skidmore.edu \
- \ Skidmore College \ Saratoga Springs, NY 12866 \ 518-581-6580 \
- \ It's a new Ice Age! Hooray!! Sled City! - Calvin & Hobbes \
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