Earlier quoted context omitted.
This kind of problem has long been solved in the mobile comms world by strong ECC codes and robust modems and channel coding algorithms. We routinely send autonomous vehicles into interplanetary space so I can't see that linking vehicles on a road is going to be a major blocker. Especially if they're on a redundant mesh network, or a smart highway.
Except the cases where you're likely to meet a large vehicle on a one-way road are most likely to be in extreme rural situations, where cell-phone coverage is far from guaranteed. And if you expect you can force non-connected cars to not exist on rural roads sometime this century, you are delusional.
Exactly 100 years ago they outlawed horse-drawn carriages from the streets of New York City (https://www.nytimes.com/store/horse-cars-last-days-1917-nson...). Based on that, I cannot imagine what the roads will look like at the end of this century, but is it inconceivable that manually-operated cars will look as outdated as horses?