Each car speeds up by 1 (up to 5), brakes to the gap ahead, dawdles by 1 with probability p, and then moves. The road loops the dial twice, so one lap is 720°.
Tap a car to make it stop for a moment. The same ?seed= always gives the same run.
LITThe Nagel–Schreckenberg model (1992). Every 10 steps the page checks one car per cell, speeds within 0–5 and a constant car count, or it throws.
AMBERThe 720° road is the site’s two-lap dial.