Well, since you think the stopping of all individuals in their vehicles to make sure they're not breaking the law in the interest of "safety" is justified:
I really feel there is a need to begin setting up checkpoints to stop drug smugglers. They would be random, but some states have to do something because it's getting to be a major problem, and it's killing a lot of innocent people. Besides, if you're not smuggling drugs, you won't have anything to worry about.
Hint - This was attempted by the NC police back in the 90's along Rt 40. It was deemed UNCONSTITUTIONAL, and unjustified by the Supreme Court in either 2001 or 2002!
For years the State of Mo and the DEA have run a drug stop on I44 in a remote unpopulated area. They don't actually set up on the interstate, but put up a sign stating that there is a drug checkpoint ahead. Drug runners see the sign and jump off on the next exit, where the cops are set up. At this point you have an out of state vehicle exiting the interstate for no apparent reason (there is absolutely nothing at the exit except a rural road going to nowhere) which gives them probable cause to ask questions.