[4][5] Bus-mounted bike carriers are usually attached to the front of the bus, and most are capable of collapsing when not in use.
[8] Others, particularly on bus rapid transit systems, are equipped with interior bicycle racks to decrease dwell time.
Some trains have dedicated cars to hold bicycles in large volumes; in some cases, external flatcars.Bikes may be mounted in the carriers by clamping both wheels and providing some additional vertical support, by clamping the rear wheel and the front dropouts (necessitating the removal of the front wheel, which may be mounted separately on blades), or by clamping the top tube (usually in the case of rear hitch mounted carriers).
Carriers that clamp on the front dropouts may also provide a built-in locking mechanism.
Special long carriers have been developed to support long-wheelbase recumbents and tandems.