A bunch of motorcycles that are lined up together.
a bunch of bikes that are all lined up
An impressive array of motorcycles recedes into the distance between a driveway and a building fronted with cars and a grassy  area, as lots of people mill about the driveway, around the bikes. 
Several motorcycles are lined up and parked on the side of the street.
A bunch of motorcycles parked in a row near a crowd.