Even the SLOWEST drivers are often pushing it 5 mph.
I mean it can be difficult to always be at that exact tick mark and sometimes something happens and we may temporarily go 5-7 mph over. That's fine, provided you slow back down.
I usually drive +/- 2 mph within the speed limit in IDEAL conditions. Very occasionally, I may end up 5 or so over for a few seconds if I don't know where I am going or am confused or something like that (I am 17 and have only been driving for 15 hours or so and am still in the permit stage), but then I'll immediately slow down once I catch myself. And often, I get tailgated for it and as soon as I turn or multiple lanes start, people accelerate hard. On two-lane roads, cars in the left lane whiz by me. Like I said, even the slowest drivers out there want to give at least 5 mph over, as I said.
Granted, I pretty much always stay in the right lane (unless I have to change lanes because the right one is a turn-right only lane) and I've heard the recommendation and even a law in some places now that if 5 or more cars line up behind you, you should pull over and let them pass, which is what I think I'll start doing. I think I'll start employing that technique in general. But I just find it amazing...it's as if it's SPEED MINIMUM, not SPEED LIMIT.
Even that SPEED LIMIT is for IDEAL conditions. In the rain, AAA recommends a 20% speed reduction, and in snow, 50%. AAA also recommends a slight reduction in speed for night-time driving.
The speed limit is 30, and so I'll drive like 28-32 mph, and I had like 8 cars lined up behind me tailgating each other within minutes.
In a 25 mph road, within seconds, there were 4 cars closely lined up behind me,
They say you are supposed to maintain a minimum following distance of 3 seconds in ideal conditions (add seconds for other conditions), which is what I do. Even if the car is super slow...in fact, if it's super slow and/or there's a lot of traffic, I'll give it an extra second or two of following distance so I can respond and brake smoothly (typically, as AAA says, your driving should be SMOOTH, and passengers shouldn't even FEEL the application of your brakes, or hardly so). Yet, one study found that the average American maintains less than one second of following distance. That seems about right. I've seen my own dad drive. Roads usually look like long caterpillars of cars.
PS What's with these cops speeding, tailgating, and not using turn signals? I think that's a part of the problem.