29-A M.R.S. §2310: Other permitted uses for buses

A bus may be used for school activities other than conveying students to and from home and school if:

1. Carrying capacity of 40 or more passengers. The bus has a carrying capacity of 40 or more passengers and is operated by a motor carrier holding an operator's permit issued by the Bureau of State Police and is integrally constructed; or

2. Multifunction school activity bus. The bus is a multifunction school activity bus that is operated by a driver who is at least 21 years of age and who has held a driver's license for at least 2 years.