A joint force of police, troops and Interior Ministry officials found some 100 motorcyclists racing on highway No 11 in Muang district and managed to stop them near the Saeng Dao intersection.
Eighty of them, aged between 13 to 16, were arrested while the rest managed to flee.
They were taken to the Muang Phitsanulok police station from where their parents picked them up. Police also seized 48 motorcycles found illegally modified for road racing.