In the weekly crackdown on road racing, police set up checkpoints on major roads in the jurisdiction of Metropolitan Police Division 4 and made the arrests. 
The results of the weekly operation was announced by Metropolitan Police Division 4 commander Pol Maj Gen Thirapong Wongratpithak and Traffic Police Division commander Pol Maj Gen Nithithorn Jintakanon at a press conference held at 1am on Saturday at the Seacon Square shopping mall on Srinakharin Road. 
Nithithorn said 81 motorcycles were seized and 27 riders under 18 and 40 adults were arrested. 
Nithithorn added that police also checked 21 motorcycle spare parts shops on Friday and seized 33 exhaust pipes that were designed to make louder noises than the legal limit.

67 arrested in road racing crackdown in Bangkok

Bangkok police arrested 67 motorcyclists on Friday night after they were found riding illegally modified motorcycles for road racing.