The chances of drivers being pulled over on Tokyo's main arteries will increase in upcoming months, but drunk drivers and speed demons will not be roadside enforcers' main targets.
Special teams of Tokyo, Chiba, Saitama and Kanagawa prefectural police will be on the lookout for users of an illegal substance that is both an environmental hazard and a costly problem for the Tokyo Metropolitan Government.
Tokyo officials recently unveiled measures to eliminate "illegal light oil," which has been available on the market as diesel fuel for several years.