My friend Johnny Klein pointed me to an fun and funny explanation of how traffic works, (or not) in Beijing, China. It's by Henry B and presented in multiple photos of drawings on paper, which work really well to get the point across.

Here's one of the simple-but-effective diagrams, followed by the caption.

To make a left turn, it is VITAL that [A] cut off all eastbound traffic as soon as possible. The first few brave or foolish legitimate pedestrians step off the curb; this is of no concern. [A] makes his move.

Henry recently posted another one on overpasses that you have to read to believe.