Traffic law enforcement and safety.
D000063:Accidents, Traffic / Q000517:prevention & control* / Q000706:statistics & numerical data; D001334:Automobile Driving / Q000331:legislation & jurisprudence* / Q000706:statistics & numerical data; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D035846:Law Enforcement / Q000379:methods*; D012107:Research Design; D012449:Safety / Q000331:legislation & jurisprudence