Supplemental material

• glimpse of a straightforward sample implementation
• simple gui
• screenshot
• outline of what happens ``behind the scenes'' when the user asks the simulation to take n steps forward
• aside: model / view separation
• (deferred: step-by-step screenshots from a short simulation run )
• directed graph diagram
• diagram for the intersection traffic rule
• assorted api hints
• random numbers
• painting / graphics
• animation
• ideas for extensions / add-ons