Sort of related, here's a bit by Douglas Adams on bicycles in China in the 80's:
"Everyone in China rides bicycles. Private cars are virtually unheard of, so the traffic in Shanghai consists of trolley-buses, taxis, vans, trucks and tidal waves of bicycles.
The first time you stand at a major intersection and watch, you are convinced that you are about to witness major carnage. Crowds of bicycles are converging on the intersection from all directions. Trucks and trolley-buses are already barrelling across it. Everyone is ringing a bell or sounding a horn and no one is showing any signs of stopping. At the moment of inevitable impact you close your eyes and wait for the horrendous crunch of mangled metal but, oddly, it never comes.
It seems impossible. You open your eyes. Several dozen bicycles and trucks have all passed straight through each other as if they were merely beams of light.
Next time you keep your eyes open and try to see how the trick's done; but however closely you watch you can't untangle the dancing, weaving patterns the bikes make as they seem to pass insubstantially through each other, all ringing their bells."