He said an interstate fully loaded. A fully loaded interstate has 10 lanes (5 on each side), and with 10x cars, each 3 meters long with 5 passengers, that's 16

He said an interstate fully loaded. A fully loaded interstate has 10 lanes (5 on each side), and with 10x cars, each 3 meters long with 5 passengers, that's 16.6 people per meter. Moving 100kph continuously bumper to bumper, not having to stop to let passengers on or off, my bet is that the interstate has more throughput than a subway train.