Bike lockers or attended covered parking are examples. This is the most secure type of bike storage since bikes are protected from both theft and inclement weather. These facilities are best for commuters who must leave their bicycles for long periods of time. Class II Parking Medium security parking which protects against theft but not against weather or vandalism. Both wheels and the frame are secured to the rack or post with a simple user supplied lock, but without the need for cables or chains supplied by the user.
Racks are more likely to cause damage to bikes due to crowding.
Class III facilities, when used alone, are the least secure method of storing bicycles. These facilities provide light security, useful for providing short-term parking.