Hopefully this highlights the total absurdity of the motorcade in the first place.
Just use a helicopter, block one street for the takeoff/landing
helicoptors are a much more dangerous way to travel though? this is already true in the best of times/when you aren't anticipating a possible attack on the passengers.
Or the absurdity of autonomous cars that can find themselves in situations where they don't know what to do, and so just stop?