XPost: rec.arts.sf.written, rec.arts.sf.science   
   From: gossg@gossg.org   
      
   Doc O'Leary  wrote:   
      
   >Probably.  Many mapping apps have traffic congestion overlays.  The   
   >sooner you can get them that information, the better.  The real problem,   
   >like I said, is when you wait to give it to them until it is so late   
   >that they feel inclined to do something stupid in reaction to it.   
      
   My wife has a fairly recent GPS in her car.  Once, we had programmed   
   the destination into the unit because we needed it for the final   
   navigation -- we knew the way for the first fifteen miles.  But, with   
   very little warning, it abruptly told us to take an exit three miles   
   before the obvious one, and adjusted the time-to-destination   
   accordingly.  As we turned onto the overpass, we saw traffic backing   
   up from something further down the road.  At other times, it's given   
   us a "congestion ahead" warning without changing the routing.   
      
   How is traffic information sent to GPS units?  Is it sent via the same   
   satellites?  Other satellites (ex XM)?  Via the cell networks?   
   --   
   We are geeks.  Resistance is voltage over current.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)