My electric cart computer allows for a max speed of 19.5 mph. In reality, it goes about 18 MPH. I have notice my cart slows down when going downhill, as if it has some sort of governor attached.
I can honestly say I very rarely take a trip in my golf cart and someone doesn't pass me going above 20 MPH. In some case way over the 20 MPH speed limit.
I personally take comfort in knowing I can never get a speeding ticket in my golf cart.
BTW - Some people think "stop signs" are suggestions, and have seen many people go thru them. Sometimes, without even making an attempt, to stop. Police will give you a ticket for what is considered a "rolling stop". That's when you wheels are still moving going thru a stop sign, but not a full stop.
I'm sure that many tickets are issued to cars than golf carts, but they is a large amount of people who have carts, that consistently exceed the speed limit. IMHO
I wonder what some people do with the couple of minutes they save after speeding to a location. Probably relax from the strain of looking over their shoulder and not getting caught.
Wouldn't it be easier to leave a few minutes earlier?
Just sayin.............
__________________
"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).