I think this is where the industry really needs to start internalizing a few rules. As an example, never trust encoding alone to provide integrity for signals tied to life critical systems. This is more true than ever, especially since it's possible to buy software defined radio solutions which work in radar bands:

http://ancortek.com/

Yes, but if you flood it with white noise, it'd screw up any transmit waveforms. The only alternative is to have a software radio that is flexible enough to switch bands when it encounters noise.

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.