> What are we supposed to do?

be aware of the other people on the road and show some courtesy? before speeding up check and see if there are people behind you and let them pass before coming up to speed.

it's really not that hard

The sped limit is the speed limit. If it goes up, we go faster, if it goes down we go slower. It isn’t rocket science. The other person can still pass if they are willing to go over the speed limit, you aren’t in the left lane unless there is someone even slower than you in the right.

It’s in the name: speed “limit”. It’s not called “only allowed speed”. There are many reasons one should travel slower than it such as rain or to let vehicles pass.

for clarity, a safe driver would maintain a lower speed to allow the car line to pass.

Again, the speed limit, you aren't supposed to go faster than it, and if you want to go faster than that, its not really my problem.

> a safe driver would maintain a lower speed to allow the car line to pass.

They can totally pass, I'm just going the speed limit. Generally the passing lane is open for a couple of miles going up, they should have time to pass.

(this only applies to mountain highway driving anyways, where I'm at, the passing lanes are designed for trucks who can't go very fast up the hills, it isn't for idiots who want to go 85 around 35 MPH curves)

you asked "What are we supposed to do?", and i just told you.

its your own fault if you choose to be a selfish unsafe & uncourteous driver who only cares about themself