Phnom Penh, Rules of the Road?

We were a little nervous on our final day as we returned to the bustling city of Phnom Penh.  We were unsure how we would fair in the flow of traffic as we worked our way back to Bernie's Bike Shop.  The challenge is not so much the volume of traffic, but rather our lack of familiarity with the local rules of the road.     The truth is that the only true "rule" is that one should remain highly predictable to other drivers at all times.  Maintaining a steady pace seems to help with this.  :-)