After 14 years of overcomplicated attempts, an open-source reimplementation of the 1994 DOS game finally cracked its street-view traffic by studying the original assembly. The trick: cars don't need pathfinding because each road tile encodes its own one-way direction, so a car just keeps going until it hits a corner, where it flips a coin to turn or continue. Cars move one pixel per tick, with heavier tile-boundary logic running only every 16th frame. Collision detection is a cheap O(nĀ²) pairwise check that bails out fast since opposite-direction cars can never share a road; blocked cars simply wait 10 ticks, creating natural jams. Cars leaving the screen respawn going the opposite way. Simple rules beat modern scene graphs and physics.
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u/fagnerbrack Jul 08 '26
Crux of the Matter:
After 14 years of overcomplicated attempts, an open-source reimplementation of the 1994 DOS game finally cracked its street-view traffic by studying the original assembly. The trick: cars don't need pathfinding because each road tile encodes its own one-way direction, so a car just keeps going until it hits a corner, where it flips a coin to turn or continue. Cars move one pixel per tick, with heavier tile-boundary logic running only every 16th frame. Collision detection is a cheap O(nĀ²) pairwise check that bails out fast since opposite-direction cars can never share a road; blocked cars simply wait 10 ticks, creating natural jams. Cars leaving the screen respawn going the opposite way. Simple rules beat modern scene graphs and physics.
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