They just need to pass a law similar to what we have in Oklahoma. Here in OK you can get a ticket for driving under the speed limit in the left lane on 4 lane highways and freeways/turnpikes.
That actually is the law in California as well, though most drivers seem to think it means you can be ticketed for "impeding" someone who wants to cruise at 75-80 in the left lane.
As for this stretch of road, I actually prefer taking CA-99 instead just because it won't put me to sleep.
Regularly signing "Keep Right except to Pass" would bring the message home. Its done in NJ and works reasonably well (at least in the southern part of the state.)
"Slower Traffic Keep Right" is just not as clear of a message and should no longer be used.
The two have different legal meanings though:
Keep right except to pass = "Do not use the left lane except to pass another vehicle"
Slower traffic keep right = "Slower drivers must move out of left lane when faster vehicle is about to overtake you"
Exactly. The former should be the rule, and if it is not the law should be changed.
During times of low-vehicle volume, keep the left lane totally vacant. Use it as a passing lane only. And once you pass the car ahead of you, get back in the right lane even if you are driving very fast because there may be someone approaching who is going even faster than you. Obviously, when it is busy, both lanes should be used to even out traffic flow.
A few years ago someone posted a video that really illustrated how much more efficient (and safer) it is to have a strict KREPT standard. The impatient speeders can be on their way, instead of shifting in and out between lanes. And there are plenty of people who believe that as long as they are at speed limit they can stay in the left lane as long as they want.