There must be a middle ground.
Can we get a sign that says no passing, but really passing is ok, but not “protected,” i.e., not the only use of the left lane?
no passing zone sign for drivers 
Do Not Pass Sign 
We have so many left entrances and exits and “multiple lanes merging” zones (As my map software speaks). Plus, some right-hand entrances are so busy that if a decent number of people don’t move into the left lane, there will be an accident.
Yet, I see people still trying to use the left lane as a “don’t be here or die” zone, “I want to go 20 MPH over the next lane,” Which is actually 40 mph over the next lane since that lane had to slow due to the heavy amount of merging traffic.
Thus, anyone in the left lane, even 5 under the speed limit, is technically passing. lol So, yes, legal use, and not in line with a full “NO PASSING” zone.
Passing the next lane by more than 20 mph IS UNSAFE
Going more than 20 mph over the next lane is super unsafe. Especially when that next lane is so far under the posted speed limit that there will inevitably be a car randomly wanting to get out of the cluster f*** and pull in front of a speeding car. Yes, especially a speeding car as they come up so fast you don’t see them, and yes, that means they want to “Pass.”
Once they are over, do not tailgate them with less than a car’s length of buffer. Especially if they’re pretty much going “at speed.” Especially when that speed is double the speed of the lane they pulled out of, and they are correctly using the “Passing Lane.”
The left land is not always a passing lane!
It’s often an exit and entrance lane.
It does not matter if they are passing as they are about to exit in less than a mile.
At highway speeds, that’s less than a minute away. You can wait. If you’re upset at them, you are why it’s even more important for them to be in that lane ASAP. They’ll need good luck getting over later with all the aggressive left-lane drivers.
In the end, what do those signs really mean?
Question, do these actually mean the same thing?
The yellow one is typically on a two-lane road; Thus, it is a serious safety issue if violated, as the risk is usually a head-on collision.
The white one seems to be less enforced/serious. I see it in construction zones, and where multiple lanes are going in the same direction. I don’t see the white one enforced in most cases if the drivers aren’t speeding.