That's great that the cop put that driver in his/her place, but that cop should have given that driver a ticket to get full kudos.
It's a shame that cops/the system only gives tickets for speeding (or not coming to a complete stop at a stop sign). That's the way it is here in California at least.
A driver can fail to signal for a lane change or cut people off or clog the pass lane, and the cops won't do a thing. But heaven forbid if you're just going around 15 mph over the speed limit!
I believe that "speeding" is safer than "slowing" or cutting people off. In part, because if you're speeding (within reason), you're not getting in anyone else's way, and you're likely an engaged driver. The other violations involve getting in the way of other drivers, and they are signs of not paying attention and/or not caring.
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To those who believe that driving at the speed limit gives them the right to park in the pass lane: following the rules still means you must be in the right lane.
The "slower traffic to the right" rule supersedes the speed limit rule. Besides, it's against the rules to take the law into your own hands. You're not a cop.
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In reality, a rule that is not enforced ceases to be a rule. If the posted speed limit was the actual speed limit, then the cops should be pulling people over for going 1 mph over, but they don't. Ergo, someone is only speeding if it's fast enough to get the cops' attention. That's unfortunate, because the law should be objective and not simply based on a cop's whim or revenue quota.
Again, the point is for those left-lane leeches: it's not for you to determine if others are "speeding" and then try to slow them down. You're only supposed to use the left lane for passing, and, when in the left lane, move to the right to make way for faster traffic.
But, it goes both ways: Unfortunately, since the pass lane rule is not enforced, it's lost most of its rule status, too. Morally, though, left-lane leeches are still very much in the wrong.
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In my experience, 15 mph over gets you a ticket nowadays here in California, and you're most susceptible when you're the only car on the road, i.e., the time when it's the safest to drive fast. So most speeding tickets really aren't about safety; they're about stealing money from us.
If the government truly believed that speeding was a safety issue, they would have speed limiters installed in all cars. After all, they force car makers to do lots of things to our cars. By the government's twisted logic, why not speed limiters too? The answer is that they see more money from speeding tickets and get more of a power kick out of fleecing us than from adding those further regulations to car makers.