The typical human driver, due to reflexes, follows the car in front of them with 2s of response time, Indepedent of speed. Therefore you can really only hope fo

The typical human driver, due to reflexes, follows the car in front of them with 2s of response time, Indepedent of speed. Therefore you can really only hope for 1800 cars/hour/lane under ideal conditions and at speeds where the length of the vehicle is a rounding error. Self driving cars could safely follow much closer, perhaps 0.5s of response time. This by itself could increase lane capacity by 4x without accounting for bad drivers getting into accidents or just disrupting the flow. Self driving cars are going to be amazing.