Article from: www.thenewspaper.com/news/01/135.asp
Hong Kong street racers had been beating the city's 70 speed cameras and 60 red light cameras for more than a year. HK police began to become suspicious when they noticed an unusual number of vehicles photographed with no license plate visible.While speeding is a serious offence, the penalty for switching or notSource: HK speed demons use vanishing plates trick (The New Paper (Singapore), 2/2/2005)
displaying your car's licence plate is not very severe.
For switching car plates, a person can be fined up to $2,000 or jailed up to
six months. For not displaying a car registration plate properly, the maximum
fine is only $400.