BARS::3 M.P.H. on I-10 West in California

GDT started collecting prime numbered speed limit signs on 1 February 2006 and we quickly learned that 5 M.P.H. signs are common; therefore, only 5 M.P.H. signs found in remote areas or unique locations are accepted. 3 M.P.H. signs on the other hand are not easily (nor are 2 M.P.H. signs).

On 2 November 2007, while driving to the 2007 DARPA Urban Grand Challenge, RoadHacker got a picture of this 3 M.P.H. sign. The picture was taken while driving west on I-10 in California.

The speed limit says...

   +--------------+
   | Empty 5  MPH |
   |  Left Lane   |
   ----------------
   | Loaded 3 MPH |
   |  Right Lane  |
   +--------------+

It turns out the sign contains off-by-one math.

   the numbers are:  5  3

   the off-by-one math is:  3! = 5 (+ 1)

   observe...
      3! = 3 * 2 * 1 = 6

GDT::BAB::BARS:: Prime Number Speed Limit Signs


Creator: Gerald Thurman [gthurman@gmail.com]
Created: 05 November 2007

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