Yes, agreed. Though speed limits higher than 75 are not something I will ever support.*
* Unless we're talking about removing a speed limit altogether and regulating unsafe driving using other criteria.
* Unless we're talking about removing a speed limit altogether and regulating unsafe driving using other criteria.
Humans with adequate following distance in the entire lane can probably manage 10 mph delta. I routinely travel dozens of miles very safely at ~80 with the flow of traffic (including the cops), and been stressed out at 55 in the carpool lane through stop and go traffic in the right-hand lanes due to on ramps/offramps.
I think 75 is memorable and roughly in the region where the tradeoff between increased kinetic energy and decreased time to arrival per additional unit of velocity becomes untenable.
Sounds like a warning page out of the back of a 94 Geo Metro owner's manual.