Numbers slowly began to decline following the 1980s peak. It is reported that, by the 1990s there were around 28,000 bōsōzoku sprinkled throughout the country. In 2004, the Japanese government passed a revised road traffic law which gave the police more power to arrest bikers riding recklessly in groups. With increased arrests and prosecutions, bōsōzoku participation rapidly went into decline. As of 2010, police reported that the new trend among bōsōzoku was to ride together in much smaller groups and to ride scooters instead of heavily modified motorcycles. Aichi Prefecture was reported to have the highest number of riders, followed by Tokyo, Osaka, Ibaraki and Fukuoka. By 2015, there were only a reported 6,771 active bōsōzoku throughout Japan. In 2013, the National Police Agency re-classified bōsōzoku biker gangs as "pseudo-yakuza" organizations.