Radar guns quattro Digest, Vol 34, Issue 37

[Huw Powell]

> Damn, at 60 MPH (88 ft/sec) that's all of 2.27 sec of timing. Given that the
> average TEENAGE reaction time is no better than 0.2 seconds (verified by
> student labs I've done over the last 15 yrs over and over again, so, about
> 900 students, I think an adequate sample based off of my old stats'
> classes), there's easily a potential error at highway speeds of nearly 10%,
> worse for around town speeds. What a SCAM!!!!

Yes, but... doesn't any given "operator" exhibit the same error at both 
ends of the measurement?  If I were to have to push a button when a car 
went by "point A" and then again when it passed "point B", in both cases 
I would be the same amount "late" (probably 2-3 seconds in my antique 
condition!), making the measurement still valid.  The errors would 
cancel out, as long as my observation conditions, position of hand 
relative to button, etc., were the same.

Of course, if I had to put down my donut and coffee for A, and my hand 
was right over the button for B, the error would increase the 
"calculated" speed.

>>I heard alot about VASCAR and other similar timing systems, which are
>>simple
>>time & distance calculators.............
>>
>>The minimum distance recommended by one manufacturer is 200 feet.
>>
>>Good info to know............
>>-Scott by BOSTON
>>
>>
> 
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-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/