The problem is multilayered and just dealing with left-lane bandits only covers up the real problems.
Our country is just waking up to the idea that driving is a fine skill that requires much practice to be good at. We have taught "defensive" driving tactics for so long that many of our drivers are afraid of what their car is capable of and how much space is needed to move efficiently. This is one instance where the Europeans are beating us, driver instruction.
First, we need to teach people about spacing and allowing people to merge into traffic, and we need to teach those people who are merging that the slip road is intended for them to accelerate to the pace of traffic then move into traffic.
Next, we need to reevaluate speed limits on limited access highways. Any reasonable interstate on a nice day is perfectly safe at 80 MPH. The state has already proven to us that the speed limit is merely in place to collect revenues. (How many years did some states insist that 55 was the safest maximum only to change it to 65 without any improvements on the road, its an aribitrary freaking number)
Then, we need to teach drivers to be courteous to each other in their travels. Not that drivers should be selfless but that they don't need to ride in the left lane, they don't need to enforce their idea of the speed limit, and they need to let other drivers move through when it will only cost them a second or two of time.
The problem is to propogate such changes in driver styles we would have to reeducate nearly the entire adult populace and then hope the new training would stick.
>First, we need to teach people about spacing and allowing people to merge into traffic, and we need to teach those people who are merging that the slip road is intended for them to accelerate to the pace of traffic then move into traffic.<
Bingo.