Good:

An Alberta policeman had a perfect spot to watch for speeders, but wasn't getting many. Then he discovered the problem.....a 12-year-old boy was standing up 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 money.

Better:

A motorist was mailed a picture of his car speeding through an automated radar post in Edmonton AB. A $40 speeding ticket was included. Being cute, he sent the police department a picture of $40. The police responded with another mailed photo of handcuffs.

Best :

A young woman was pulled over for speeding. As the Saskatchewan R.C.M.P. Officer walked to her car window, flipping open his ticket book, she said, "I bet your are going to sell me a ticket to the R.C.M.P. Ball."

He replied, "Ma'am, Saskatchewan R.C.M.P. don't have balls."

There was a moment of silence while she smiled, and he realized what he'd just said.

He then closed his book, got back in his patrol car and drove off.

She was laughing too hard to start her car.

I think it was in 2000 when the Dutch, who have black letters on Yellow Background license plates, decided that in order to help regulate taxi´s (ie: ensuring more lgitimate -registered - taxis) changed a rule that any authorised taxi car had different licence plates.... Black letters on a dark blue Background....

Black and white speed camera´s thereafter took thousands of pictures of mercedes speeding everywhere.... The camera´s couldn´t pick up the letters because of the colours..