Article from: www.thenewspaper.com/news/02/248.asp
Online traffic school entrepreneur Steve Soldis has beat city hall. After being ticketed for speeding on Summerfield Road in Santa Rosa, California he challenged the road's speed limit in court and won.California Vehicle Code Section 40802. (a) A speed trap is either of the following:Source: SR 'speed trap' runs into trouble (Santa Rosa Press Democrat (CA), 3/10/2005)
...(2) A particular section of a highway with a prima facie speed limit that is provided by this code or by local ordinance .... if that prima facie speed limit is not justified by an engineering and traffic survey conducted within five years prior to the date of the alleged violation, and enforcement of the speed limit involves the use of radar or any other electronic device that measures the speed of moving objects. This paragraph does not apply to a local street, road, or school zone.