XPost: comp.mobile.android, comp.mobile.ipad   
   From: YourName@YourISP.com   
      
   In article , Neil Ellwood   
    wrote:   
      
   > On Sat, 08 Mar 2014 12:30:15 -0800, Liam O'Connor wrote:   
   >   
   > > On Fri, 07 Mar 2014 11:19:07 -0800, Don Kirkman wrote:   
   > >   
   > >> In my state, California, Stop signs are red and hexagonal, Yield signs   
   > >> are yellow and triangular.  I assume most US states have similar   
   > >> distinctions.   
   > >   
   > > Hey, just as an aside.   
   > > Do you know WHY they are the distinctive shape they are?   
   > >   
   > > The reason, I read somewhere, I think in the 1976 MUTCD, is that the   
   > > OTHER driver (the one who does *not* have a STOP sign),   
   > > can *recognize* that there is a stop sign, merely from the back of the   
   > > sign.   
   > >   
   > > That is, the octagonal and triangular shapes tell the OTHER driver that   
   > > you have the respective signage applying to you.   
   > >   
   > > That's pretty neat!   
   >   
   > If you are driving a car at around 30mph where there is stop sign on a   
   > side road how near are you to first recognise the shape of the sign?   
      
   The problem is that signs are often hidden by trees, obscured   
   intersections, etc. It's often easier to use the road markings - here   
   in New Zealand a "Give Way" / "Yeild" sign has a white double line   
   across the lane, while a "Stop" sign has a yellow doule line across the   
   lane. An uncontrolled intersection has no line across the lane.   
      
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