What is the throughput of highways vs public transit? I wouldn’t be surprised if it was two orders of magnitude greater person hours on roads in non public transit.
The highway mileage includes 306 billion passenger-miles on non-transit buses.
Amtrak (6 billion passenger miles) isn't considered transit.
Regardless of what the US does, throughput is much higher on public transit than it is on highways. You can fit so many more people on buses and trains than in automobiles.
For the actual numbers, compare deaths-per-passenger-mile in-city and deaths-per-passenger-mile between cities (highways vs buses, trains, etc), and you will see huge difference in fatality rate.