Ex OTR trucker here.
1 some states do have strickter State trooper. IMHO, Ohio, Indiana, Conn, and Va. are some of the tough one. But the nastist was in Ark. Maine on the other hand has some of the niceist. I was pulled, ticketed, in maine for to long of a trialer (53') w/o a permit. Nice LOE did his job, told me a great local place to park (food, phone, and entertainment) until I was able to get the permit for the tariler.
2 Alot of states use old patlor car for speed contol. I have seen them on I485 arond charlotte. I love them, after they scare me, they just sit there and do not come after me like the real one do. Charlotte even parks them in front of convenace store.