Berlin is well known for its highly developed bicycle lane system. It is estimated Berlin has 710 bicycles per 1000 residents. Around 500,000 daily bike riders accounted for 13% of total traffic in 2010. Cyclists have access to  of bicycle paths including approximately  of mandatory bicycle paths,  of off-road bicycle routes,  of bicycle lanes on roads,  of shared bus lanes which are also open to cyclists,  of combined pedestrian/bike paths and  of marked bicycle lanes on roadside pavements (or sidewalks). Riders are allowed to carry their bicycles on , S-Bahn and U-Bahn trains, on trams, and on night buses if a bike ticket is purchased.