XPost: rec.arts.sf.written, rec.arts.sf.science   
   From: JRStern@foobar.invalid   
      
   On Thu, 16 Jan 2014 10:54:53 +0800, Robert Bannister   
    wrote:   
      
   >>> But if every car were using that, wouldn't there be some interference?   
   >>   
   >> Most likely they use encoded signals so that each car can distinguish   
   >> its own returns from those of others.   
   >   
   >I guessed there would be something like that, and no doubt there are   
   >millions of possible codes, but then there are millions of cars on the road.   
      
   There is a pretty much unlimited supply of numbers available at very   
   reasonable cost (zero), so this is not in itself a problem.   
      
   In fact, hmm, it might even be possible for codes to be public and   
   associated with exactly known frequencies, and then one broadcaster   
   could illuminate traffic for many receivers, it would be much like   
   managing packet-switched network collisions.   
      
   Hmm, ...   
      
   J.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)