What are the primary regulations governing remunerated school transport (transporte remunerado de escolares) in Chile under Decreto Supremo 38 (MTT)?

1. Any private passenger car may transport school children with no special equipment or markings
2. The vehicle must be painted official yellow (or white if PBV > 3,860 kg), display a flashing 360-degree amber roof beacon, carry valid school identification cards, have forward-facing seats with seatbelts, prohibit standing passengers, and have an adult escort if transporting more than 5 preschool children
3. Children may stand in the aisles if trips are under 15 minutes
4. School transport drivers are exempt from having professional licenses