20% means you drive at 80 in a 65. That is in no way acceptable.
I don’t know what you really mean by acceptable, but there are plenty of roads with a 65 mph speed limit where 80 miles an hour is perfectly safe, and there are of course plenty of roads with a 65 mph speed limit where 70 mph is and unsafely fast. And there are road conditions in all of those roads where 45 mph would be on unsafe. It is difficult to make blanket statements about what a safe speed is knowing nothing other than the posted speed limit.
To put the same point in a different context, remember that it wasn’t really that long ago that there was a national 55 mph speed limit, and many of the same interstates that used to have a 55 mph speed limit now have an 80 mph speed limit.
IMO roads with 80 MPH speed limits are much safer. Even the crazy folks don’t go much over, so you don’t get a huge delta in speed, which is a lot more dangerous than any absolute number.
There's stretches of flat, straight-ish interstate in the US that continue for dozens of miles with near-perfect visibility. Sometimes, there's no traffic. Go 120 for all I care, just slow down when you're near something.
Or the road is in good condition.
Or that your tires are rated for that speed (T or higher).
That's the wrong approach for a left turn.
> Imagine actually having protocols around traffic flow, and following them!
Like limits on the magnitude of vehicular velocity?
That depends on the highway. If it's a limited access motorway, like the interstates, Autobahn, or M-class then sure. Perhaps not coincidentally, that is where the right lane rule you propose is mandated.
Otherwise, it fails often. Reality is messy.
If you truly want to make the roads safer, follow the posted speed limits. (Energy follows the square of the speed.) Also, always ensure you leave enough room to stop (the "2 second rule").
I observed that it especially works best in concert with a rule that people entering/merging from the right have the right-of-way, since this reduces uncertainty around "who will go?" that I often witness here in NA (where "keep right to except to pass" is merely a suggestion, or not enforced even if enshrined in law).
Regarding speed limit, I'm not arguing against speed limits or adhering to them, and indeed the more consistent the speed of traffic, the safer it is. On that note, my observation is that simply adhering to the speed limit (and attempting to stay at that speed) means regularly passing vehicles -- that is, in most cases, people are indeed following speed limits and a "keep right except to pass" policy correlates well with maintaining consistent speed and flow of traffic. People who want to drive slower can stick to the right lane without any hassle or problem (it's accepted and normal for them to drive slow there), and those who are driving faster can safely pass and then return to that right lane. If there are deep flaws in this process, I'm absolutely not seeing them and have not observed them.
(yes, of course, the "two-second" rule makes sense and is a minimum IMO - I imagine if more people followed this, crashes would be massively reduced)
In Germany you get fined and ticketed for it. In NA you don't. It's that simple.
I almost want to become a cop just so I can write tickets for this.