This entire article is predicated on a local college student who measured speeds after the speed trap happened. That student then concluded that the speed trap was ineffective. Shouldn't he have also measured speeds prior to the speed trap?
I know that areas in my town that are well known for speed traps definitely have a lower occurrence of people speeding. On a neighborhood road near my house we had a really bad problem with speeders. Over the course of several months, there were numerous speed traps. Today, there are less speeders than before.