Assuming all cars are traveling at a speed that gives 3 seconds of time between cars, any change to speed limit cannot affect the traveler throughput, and each car added lowers the speed of all other cars, including those at the front.
I don’t think this assumption holds. I don’t know what shape the actual speed-distance relationship is, but it’s not a straight line at a given number of seconds.
I also think the throughput measure (cars entering/exiting per hour) is rarely the most important thing for drivers or even planners. Average trip time outweighs it heavily.
I don’t think this assumption holds. I don’t know what shape the actual speed-distance relationship is, but it’s not a straight line at a given number of seconds.
I also think the throughput measure (cars entering/exiting per hour) is rarely the most important thing for drivers or even planners. Average trip time outweighs it heavily.
Oh definitely—I don’t think this is practical advice for traffic designers