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With all the illegal high power CBs truckers are still using, 50KW stations less than 1/4 mile from the road, and first responder cars and trucks with radio equipment out there all cars have to be built immune to RF noise. If Karen the soccer mom's minivan locks it's brakes at 80MPH on the highway and 20kids go splat because an ABS system wasn't properly shielded against RF you can bet the company that made the ABS system and or the car would be sued out of existence.
What has made for the decline in car ham radio and CB is smartphones with GPS navigation, you can call for help or anything, google tracks traffic flow along roads better than any commuter ham net could have ever hoped to, reroutes traffic to avoid traffic jams, let's drivers rat out speed traps to every other driver using navigation on the route, and can manage your music by voice command so you don't have to touch anything and will automatically mute music when it needs to remind you to turn.
Some of the driving nannies (lane keep assistance, automatic breaking to avoid crashing, cruise control that adapts to the speed of the driver infront of you) and autopilot systems are imperfect, but for the most part not RF interference suceptible...The exception would be radar based systems that are potentially sensitive to other radar systems. Ham communications shouldn't be able to interfere. And with regards to the autonomous nanny systems your still responsible for checking their work and overriding them if they mess up. Most of the screw ups are computer programming related...it's not hard to fool various sensors and machine vision software is still quite primitive.
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