Couple of things.
First, foremost: Slower traffic keep right.
Simple, succinct, and (in one form or another) the law in most states. One of our principal problems (perhaps the biggest single problem) on the Interstate Highways and other major divided roads is that this fundamental principle has been lost. The reason you can have substantial speed differences in Europe without blood rolling in the roads, is that there is a reasonable degree of predictability to the way traffic flows.
I am amazed (I guess I should not be) at the proportion of putatively-educated people who either know nothing about this basic right-of-way rule, or misconstrue it to their chosen meaning.
Most common misconception: "If I [believe I] am going the speed limit, then I need not yield to overtaking traffic. To these people, I say, "If you want to be a traffic cop, go to the academy and get a badge." The pig-headed practice of clinging to the left lane in a multi-lane road, to the detriment of all traffic behind, causes substantial congestion and is frequently a producing cause of accidents. These "left lane bandits" (credit to Csaba Csere for the term) not only impede the flow of traffic, but they make necessary the unsafe practice of passing on the right. In conversation with folks who think this behavior is acceptable, I most often hear the excuse, "Well, I am going fast enough, they should just slow down to the same speed I am going...," thus utterly disregarding the mayhem they are creating behind them.
You need only fly along above a heavily-traveled highway (say, I-35 between Dallas and San Antonio), to see the long, serpentine back-ups caused by these people, and you can actually watch the traffic disruptions and near-accidents caused by rippling waves of brake lights as a minor hitch works its way back through the line of frustrated drivers.
All because some nimrod at the front of the line is too selfish to move over, and let traffic go by.
By the way, I freely admit that I have been one of those who tries to go very fast, but the stress associated with that is just too much. In most open-road situations, I try to set the cruise at 75-78 MPH, a speed at which I make good time, get good mileage (27.5 mpg in my Caddy, as long as my gasoline is not contaminated with ethanol; 22-23 mpg if it has been so tainted). At this speed, if I do not encounter a conga-line of left-lane bandit victims, I can serenely make my way along, using the left lane only for passing, signaling for all lane changes and rarely having to even touch the brake pedal.
But all it takes to mess it up, is one selfish jerk at the front (bumper sticker: "Ask me about my grandbabies").
Second, and a corollary to no. 1 above: Use the brake pedal (and the gas pedal) less.
There has been research done showing that most brake pedal applications are unnecessary, and my real-world experience has borne it out for me. For the vast majority of drivers out there, any time they see traffic ahead slowing, they immediately apply the brakes, sometimes just enough to light the brake lights; the majority of drivers behind them will then, assuming that the car ahead is slowing, put on their brakes, causing that same wave-action to ripple through the traffic behind, in most instances without any slowing actually required.
Try it yourselves. When you see brake lights ahead, don't just jump on the brakes- be ready to brake if needed, but just lift off of the gas. In most instances, you won't need the brakes, and you'll be able to proceed back on the gas (less than you would have needed had you actually braked) in a brief moment.
Our pathetic driver "training" practices are largely to blame for this; I still recall being told to "tap" my brake pedal to turn on the brake lights as a "signal" to drivers behind me, even where no brake application is being made. Stupid. One should be able to presume, when seeing brake lights, that actual braking is occurring, but this inane practice of using the brake lights as some sort of semaphore (i.e., lighting them when actual and substantive braking is not occurring) should be put to pasture. The net effect would- could- be that roads could carry more traffic, at higher average speeds, with a lot less stress.
I dream again...