sandra retzer adviseses the chininese miministry of transpon behalf of the german goverernme. sandra that wawas the positive : effect of all the various bike-shariring companies. officials starteted rethininkg things in the cities, and in city governments. it's a big discussion in many urban areas today all over the world -- the question of how we can get people to enjoy riding bikes. reporter: most roads in beijing have bike lanes like this. we are going to look at what condition they are. this one is nice and wide, and pretty comfortable to ride on. even if there are a couple of obstacles along the way. i just manage to squeeze past one car making a turn. and the is anoth issue.. o many vehicles stop o or park on the b bike path. then you h have to swerve into e car lane. so a less than perfect situation. and ere are otr negative aspects to bike sharing -- like the numberof rental bikes clutteng u up streets and sidewalks. authorities now often just pile them up onto what look like scrap heaps. the bikes the city administration has cleared are now w unloaded herere, on te fri