If you join the nmafoundation.org their Jan/Feb newsletter has an article by Henry Roberts, on pages 7 & 11 (or double$) about
: Visual Speed.
While the 855 foot mark isn't directly quoted on page 11, a foot note #3 has this source:
Paul L. Connolly and Ingeborg Schmidt,
Visual Considerations of the Man, the Vehicle and the Highway (New York: Society of Automotive Engineers, 1966): 12 and 17.
The number 855 is used on page 7 and seems to be a calculation comparing the human eye ability measured on a Snellen eye chart (20/20 vision) and equating it to a 6" high (and 12" wide) license plate "viewed at a distance of 855 feet."
The 1580 was the LIDAR targeting distance in (this) actual case. Its irrelevant to the 855 feet "benchmark" reference, except that 1580 feet is FAR beyond 855 feet.......................
-Suf Daddy
Quote:
|
Originally Posted by 2600-hotbird Is this a standard reference or somewhere easily quotable?
“You hit my car at 1580 feet, more than a third of a mile - which is nearly twice the eye limiting resolution of 855 feet, so it would be impossible to have a 100% accuracy won’t it?” |
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