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  • \$\begingroup\$ Any restrictions on how slowly or quickly the animation must run? \$\endgroup\$ Commented Dec 27, 2016 at 5:23
  • \$\begingroup\$ Perhaps it's worth specifying that the type of car that moves alternates each step. \$\endgroup\$ Commented Dec 27, 2016 at 5:37
  • \$\begingroup\$ @xnor I was thinking at least 5 or 10 ms per loop, but I'm not really sure if that would be difficult to measure. \$\endgroup\$ Commented Dec 27, 2016 at 5:39
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    \$\begingroup\$ Does the density mean that the density has to be that value, or just that each pixel has a probability d to be filled? Also, do we have to assign the color of the cars randomly or not? If randomly, again is it ok if they just have a 50-50 chance of being either colour? \$\endgroup\$ Commented Dec 27, 2016 at 12:29
  • 1
    \$\begingroup\$ @JarkoDubbeldam The density has to be that value. They have a 50-50 chance of being each color. However I answered late so answers may be different. Cars can move up or left. \$\endgroup\$ Commented Dec 27, 2016 at 22:35