No. I watch very carefully when I'm driving, "l3v1" and "danbert8" are right.... I see it constantly here, people in other lanes with NOBODY behind them... it seems like people don't know how to even coast a bit, if they're not stepping on the gas, they have to be stepping on the break.... or something, I don't know, but when I see people speed up, slow down, speed up, slow down, in the lane next to me, with NOBODY behind them, I have to conclude the world has far too many idiots. I've also been far behind people that I subsequently caught up to - single lane roads where you'd just periodically see them breaking. I honestly don't think that many people are breaking (at least around here) for tailgaters, because I see tailgaters all the time, too, without the people being tailgated breaking.
And like l3v1 pointed out, people don't signal to change lanes...
I've actually had this discussion with a group of coworkers, while we were working on site in another state, including people from outside the U.S., and I say you should always signal a turn or lane change no matter what - it's NEVER bad to signal, it's sometimes (if not often) bad to not signal. "Bad," in this case, doesn't even necessarily mean dangerous - signalling sometimes is just an act of common courtesy to let people know what you're doing - it might not even be another car, it could be a bicyclist or a pedestrian. There were actually a couple of people who argued against it... it was unbelievable. And the guy that swore up and down he always signaled "when necessary" was weaving across all the lanes and didn't signal once.
The bottom line is that far too many drivers lack common courtesy, common sense, and are oblivious to the effects they're having on the world around them. The sad thing is that ONE person going slow on the interstate can create a dangerous situation for hundreds of people, even for people just trying to go the limit, even five or six lanes out. I witness this every day on my commute to work. All it takes is one in a hundred to drive that way to screw things up for everybody, and it's more like 5 or 10 in a hundred that drive that way.
And along with his freeway comment - if there's more than two lanes, the right lane should be for people entering and exiting the freeway, especially in urban areas where there exits are frequent, but my biggest pet peeve is that people don't use the on-ramp to accelerate up to the speed of the traffic they're going to have to merge with.... 45, even 35MPH all the way down the ramp... then reach the end and can't understand why they can't merge in with traffic going 70MPH (yes, that's the limit where I get on the interstate).