In contrast, here in California there are a variety of fines for U-Turns, depending on context, but the most common ("at Controlled Intersection," "in Business District," "in Residential District," "Near Fire Station," "on Highway Without Unobstructed View") will all run you over $200, and over $250 if you intend to go to traffic school. [2]
Of course, this doesn't address the myriad other "offenses" in Singapore which may result in steep fines, jail time, caning, or worse, and how those collectively influence the public's adherence to the law. But a little unexpected and interesting nonetheless.
[1] http://www.singapore-drivers.com/index.php?option=com_conten... (This same list of fines is posted verbatim on a number of other sites, but I couldn't find a more official source. This article on the Singapore Police Force site has some interesting info, but nothing specific about fines for U-Turns: http://driving-in-singapore.spf.gov.sg/services/Driving_in_S...)
[2] California Uniform Bail and Penalty Schedules, January 2010 edition. http://www.courtinfo.ca.gov/reference/documents/2010_jcbail...., P. 33.