Just make it illegal, and make it come with a fine of minimum 10 000 baht for the parents to pay. That will probably make 99% of the parents reassure their children stay in the right lane.
Yes, Thailand is truly amazing. They have now mastered the world, by stating Thai´s are 5 times smarter than the rest of the world population. That based on numbers showing that only 2,2 % of the worlds population have an IQ at 130 and over.