This provision is both an "objective emission" control and a "subjective immission" control. It can set a maximum sound level at a specified distance (typically 50 feet). It can have a curfew. It can be based on "noise disturbance" in the community. It can also require the use of ear protectors on passengers. Unlike motorboats, the sound generators on these vehicles are airborne, resulting in more noise impact. Florida (Section 327.65) requires a maximum level of 90 DB(A). Maine (Title 12 Section 13068-A)has three levels: operating, operating test and stationary test