When the girls are seen riding 3 abreast, they're obviously strapped to a 3 rail motorcycle trailer. Throttles are twisted, bars are turned but no resulting speed or directional changes.
The three girls talk to each other while riding their motorcycles yet they can hear each other with no apparent problems. They do not seem to have to yell to be heard and this is with all three wearing full motorcycle helmets with face shields!
The 3 motorcycles are twin cylinder four strokes but the sound comes from 2 stroke singles.
The motorcycle riders wiggle the clutch and throttle at random.