From Wikipedia Picture of the Day; September 28, 2016:

The Biham–Middleton–Levine traffic model for a 144 x 89 lattice, with a traffic density of 39%. The model has self-organized to a disordered intermediate phase. The red cars and blue cars take turns to move; the red ones only move rightwards, and the blue ones move downwards. Every time, all the cars of the same color try to move one step if there is no car in front of it. This video has been sped up such that only one in four frames is shown.