From: superkuh@superkuh.com   
      
   "The US National Highway Traffic Safety Administration (NHTSA) is   
   proposing a requirement that every car should broadcast a cleartext   
   message specifying its exact position, speed, and heading ten times per   
   second."  The RF broadcast would be on Channel 172 on the 5.9 GHz band   
   at ~15 dBm (the minimum suggested) to achieve a 300m range. The purpose   
   would be to aid autonomous vehicles.   
      
   These cleartext messages sound like they'll be signed with a rotating   
   set of some ~tens of keys as a basic protection against some kinds of   
   spoofing.   
      
   The dangers of spoofing a system (ie, GPS or this) used by autonomous   
   vehicles to plan routes is obvious. The dangers of yet another source of   
   location data may not be.   
      
   It can be argued that people have already given up on not being tracked   
   everywhere due to the prevalence of tracking smart phones (both   
   software/gps and basestation/multilateration) and of license plate   
   readers and their databases.   
      
   But at least those things are mostly optional. Mandating this broadcast   
   on all cars is a major change even if the range is nominally only 300m.   
      
   ref: https://www.gpo.gov/fdsys/pkg/FR-2017-01-12/pdf/2016-31059.pdf -   
   The RF bits start around page 32.   
      
   ref, summary:   
   https://freedom-to-tinker.com/2017/06/21/killing-car-privacy-by-   
   ederal-mandate/   
      
   It sounds somewhat similar to an already existing NHTSA creation: the   
   tire pressure monitoring system (tpms) that already exist in some   
   vehicles/tires. These signals can uniquely identify a vehicle and can be   
   received with $8 dvb-t usb sticks used as software defined radios   
   (rtlsdr) and decoded using https://github.com/jboone/tpms   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)