In terms of the SDR stuff, I'm thinking more about it being in the hands of a threat actor. One of the things that Tesla nor Google have had to contend with to date in their trials are intentional disruption and subversion of their systems and I only hope they've hired security engineers to consider more than just IT stack vulnerabilities like those explored by Charlie Miller & Chris Valasek (
https://www.youtube.com/watch?v=OobLb1McxnI). A great number of jobs are at risk from this technology from long haul truck drivers to bus and cab drivers. This will certainly result in tensions which could result in threat actors going after sensing systems. Readily available radar frequency SDR in those conditions really could be used for harm.