Good:

A police officer had a perfect spot to watch for speeders but wasn't getting any.  Then, the 
officer discovered the problem--a ten year old was standing up on the side of the road with a
hand painted sign which read "Radar Trap Ahead."  The officer then found a young accomplice
down the road with a sign reading "Tips" and a bucket full of change.

Better:

A motorist was mailed a picture of the car speeding through an automated radar.  A $40.00 
speeding ticket was included.  Being cute, the motorist sent the police department a picture 
of $40.00.  The police responded with another mailing of a photo--of handcuffs.

Best:

A young woman was pulled over for speeding.  As the motorcycle officer walked to the car 
window, flipping over his ticket book, the woman said, "I bet you are going to sell me a ticket 
to the Highway Patrolmen's Ball."  The officer replied, "Highway Patrolmen don't have balls."  
There was a moment of silence while she smiled, and he realized what he'd said.  He 
then closed the book, got back on his motorcycle and left.  She was laughing too hard to start 
her car for several minutes.