Well, Mr. John Henry, let's discuss the fundamentals we all should have learned in our driver's education courses. The "posted speed" you're referring to is actually called the SPEED LIMIT, or in other words, 'how fast you may go up to a certain point.' Let's say the "posted speed" is 45mph, and you are going 46mph...well, you're breaking the law. Now, while it may be ANNOYING to have to be behind someone driving 10mph below the speed limit in the "fast lane", it is still your responsibility as a licensed driver to maneuver your car around this driver safely. Same reason you can't get upset when there's an animal in the road, you must safely avoid that "impediment" as well. If you would rather break the law and exceed the speed limit and drive recklessly to avoid such "impediments", creating this "Wilmington weave", then YOU yourself are responsible for creating a traffic hazard, not the "impediment".