A lot of hills have passing lanes _specifically_ for this issue.

By that logic, that the time vehicles are on the road are necessarily limiting capacity of the system, then we should be vastly increasing the speed limit! Why not 100mph? 120mph?

I mean, it's only 3 times the kinetic energy (over 70mph), so any crash would be that much more dangerous/deadly. It's also very wasteful with respect to fuel, so you'd need to stop more often which would decrease your average speed.

Regardless, all of you all drive way too fast as is. It's not safe, it's not efficient.