Thanks, Sal! In industrial control systems, "safety" is sometimes used as an excuse for not upgrading insecure systems, hopefully vehicular control system designers won't try that weak argument. Insecure V2V is very unsafe.
http://www.nhtsa.gov/About+NHTSA/Press+Releases/NHTSA-issues-advanced-notice
-of-proposed-rulemaking-on-V2V-communications
is the release
http://www.nhtsa.gov/staticfiles/rulemaking/pdf/V2V/V2V-ANPRM_081514.pdf
is the notice.
Cheers,
Sal