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From: bmt@we53.UUCP ( B. M. Thomas )
Newsgroups: net.auto
Subject: Re: speedometer calibration and radar
Message-ID: <288@we53.UUCP>
Date: Sat, 2-Mar-85 17:09:46 EST
Article-I.D.: we53.288
Posted: Sat Mar  2 17:09:46 1985
Date-Received: Sun, 3-Mar-85 05:16:38 EST
References: <714@inuxd.UUCP> <237@gcc-bill.ARPA>
Organization: AT&T Technologies - St. Louis Missouri
Lines: 9

The error in a speedometer's calibration is rarely if ever a fixed offset.
Rather, a ratio of error is present, which makes it greater at higher speeds.
I was ticketed for doing 52 when I happened to be watching my speedometer
stay very close to 40.  Obviously, I checked the calibration immediately
and found that when my speedometer said 30, my dad's, which I was following
very closely, said I was doing about 40.  It is very possible that your
speedometer was in error by this much, in fact, the commonness of this
state of affairs is one reason that a lot of police officers give you as 
much as a 10 mph leeway.