My apartment is only a little way from one of the main east-west roads in Baiyin. On this road a never ending stream extremely noisy cement mixers and massive trucks full of rubble rumble by heading from the east to the west. The puzzling thing is that an almost identical stream of cement mixers and rubble-filled trucks rumble by from west to east. What's going on? Are they engaged in some ritualistic, never-ending, Sisyphean task of driving rubble round in circles? Does one fleet unload in the west and the other fleet promptly load up and take it all back to be unloaded and reloaded in the east?
I've asked Chinese friends who all agree that it's a puzzler, but no one has yet provided any kind of explanation.
And in one further random oddity, tonight I saw a similarly laden truck heading north to south.