Ferrari Mailing List: Re: Ferrari Digest, Vol 1, Issue 17

[Dave Handa (dave]

I would agree that those mile markets have to be pretty darn close, since in
Washington State, those signs are usually accompanied by bold, white "V"'s
and "T"'s which the Washington State Patrol uses for speed enforcement from
aircraft...timing vehicles between the markers, then radioing to patrol cars
on on-ramps to pull violators over.

Dave




-----Original Message-----
From: Dennis Liu [mailto:BigHeadDennis [at] earthlink.net] 
Sent: Tuesday, August 29, 2006 2:34 PM
To: dave [at] davehanda.com
Cc: 'The FerrariList'
Subject: Re: [Ferrari] Ferrari Digest, Vol 1, Issue 17

Most highways around me have specific sections, usually labeled "measured
mile", where the markers are ostensibly accurate enough to allow exactly
what I proposed - to check accuracy of instrumentation with any watch with a
second hand.  

Vty,

--Dennis


-----Original Message-----
From: BRIGANDBAR [at] aol.com [mailto:BRIGANDBAR [at] aol.com] 
Sent: Tuesday, August 29, 2006 6:17 PM
To: Dennis Liu
Cc: The FerrariList
Subject: Re: [Ferrari] Ferrari Digest, Vol 1, Issue 17

 
In a message dated 8/29/2006 3:28:39 P.M. Central Standard Time,
ferrari-request [at] ferrarilist.com writes:

else  just use a
decent watch and time the mileage  markers.



Dennis et. al.
 
I'd like to add a caveat here.  Most mileage markers, particularly  those
simply listing highway mileage on a post without precision additions such
as decimal point measurements, are notoriously inaccurate. These are not
survey points, but informational signals. Additionally, mileage actually
traveled on a roadway may be affected by things such as curves with varying
radii, etc. And then there is always the parallax issue relating to trying
to time points by visually starting and stopping a timing device. Add to
those "reaction time"  
issues in starting and stopping the chronograph and the error factor is
further  altered.  Will these cumulatively result in an error rate of
+/-10%? Most probably not, but it is difficult to determine if the errors
are cumulative, or  offsetting.  Actually, one of the best ways to determine
actual speed (at least in some semblance of the legal speed limits, is to
find a friendly state  trooper or local police officer who has an interstate
highway within his jurisdiction and "beat" and simply ask him to clock the
car on radar (while setting speed parameters that do not result in the
issuance of a citation). If this sounds absurd to you, trust me, after 30
years of experience within the "community"  prior to retirement from the
public sector, and being married  to a Chief of Police with about the same
tenure, I can assure you that many police officers are car enthusiasts such
as ourselves.  And we have a  pretty significant advantage in that in most
jurisdictions these officers have  probably not even seen a Ferrari at all,
let alone in a "close up" perspective.  If you really want to add to their
enthusiasm, invite them to ride in the car.  
Unless you are in So. CA or an affluent suburb of a major (prosperous) city
he/she may be the only officer in the department that has ever ridden in a
Ferrari. I the circumstances are appropriate, i.e., if the officer is a
neighbor, acquaintance, etc., offer his/her kid a ride. You might even be
surprised as to exactly what speeds can be checked without a citation at the
right time and location.
 
Dr. Steve  

1964 Rolls  Royce Silver Cloud III    1975 Pontiac GV Conv.
1980 MB  450SL                 1982 RR  Corniche
1994 F-350 Powerstroke  4x4          1996  Bronco
2000 Lincoln Town  Car                   2004  Excursion
1995 Ferrari 348 Spyder
+ Audrey's 3x MB's

Dr.  Stephen B. Spies, CES, CFI
Director, Forensic Sciences  Laboratory
Explosives Engineering Technologies

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