I have seen Seoul police cars driving with their rooftop lights flashing but not pulling over a driver or trying to get someplace faster. Seoul Police Officers are mostly seen controlling traffic intersections and conducting drunk driving checks. Other than that, I have not seen them perform other forms of law enforcement.

Gyopowife guesses the lack of law enforcement is related to the safety of Seoul. There are few violent crimes. Gun control is strict, people look out for each other, Korea invented Tae Kwon Do šŸ™‚