It's similar in Poland. It's against the law to cross the street on red light. Even if the street is completely empty of cars. So what police and city guard often do is hide somewhere in the bushes near universities and catch students trying to cross the street 'illegally'. It's an easy and safe way to bump up statistics and make some money off tickets. Unfortunately, in many cases, performance review for police is done on number of cases and money made off tickets rather than severity of crimes. As a result you have police bothering low hanging fruit in form of teenagers and avoiding the tough crimes like murderers and drug dealers.