(1) The car is going to have a unique id for services the driver pays for (2) the car has a cellular modem, and (3) the car has a GPS, the apocalypse is not in the future but happened in 1996
https://en.wikipedia.org/wiki/OnStar
Back then I wanted to make a spoof ad that focused on the keyword 'safety' (used in their ads) but in the register of a British person defending the presence of enough cameras in the London Underground to make Big Brother blush. White collar criminals are driving to the hydrofoil with suitcases of cash and the day is only saved because the car has OnStar and the control center is able to track the car and shut it down with a warrant from law enforcement.
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This technology is stuck after 20 years
https://www.its.dot.gov/research_archives/safety/v2v_comm_sa...
and is likely to stay stuck indefinitely because there is no acceptable answer to the problems of privacy and security. (e.g. the best is "All drivers have to buy a plan from Verizon but Verizon has to fix the dead spots in its network" but Verizon's bean counters know that this ends in the bankruptcy court because the fixing the next x% of dead spots doubles the cost) You might think the cellular network doesn't have to be involved but otherwise stopping spoofing seems intractable; I think the killer app for
https://en.wikipedia.org/wiki/Dedicated_short-range_communic...
is something that simulates a demolition derby in your neighborhood so that people slow down or that can make the tailgater behind you hit the brake. I'd have built one a long time ago if it was easy to get DSRC chips.