South Carolina's infamous "Bluffton Speed Trap." In Bluffton, SC, the speed limit on a mostly open 2-lane road is 55 mph, which is completely safe in any car (hell, in a proper sports car, I've tripled that number when no one was around). But there is a section of road about 100 yards long where it drops to 15 mph as you pass a post office and a few houses, and then goes right back to 55. Except there is ALWAYS a cop sitting right there. You see, no one stops in Bluffton, why would they? So a massive revenue stream for the town is this speed trap. It's mostly people who fly into Savannah or Hilton Head from out of town and would never return back just to fight the ticket, so they pay and move on. I got ticketed there for 55 in a 15 and was handcuffed for reckless driving, and given a $1,000 ticket. There is no reason to have an arbitrary drop of 40 mph other than to make those lazy cops' jobs easier.