Creating Traffic Jams with LEGO Cars
Brick Technology
Mar 21, 2026 14:01
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In this video, I build a circular road system with 22 LEGO cars to recreate real traffic flow and find out when traffic suddenly breaks down. Each car is programmed to behave like a human driver, reacting to the distance of the car in front by braking and accelerating.
By gradually adding more cars, a surprising result appears: at a certain point, traffic becomes unstable and a traffic jam forms out of nowhere.
I also tested different types of drivers, including normal human drivers, distracted drivers, and self-driving robot cars. The results show how even small differences in behavior can completely change the flow of traffic.
The system uses a magnetic guidance mechanism inspired by Miniatur Wunderland, where vehicles follow hidden steel tracks inside the road.
The road system was fully 3D printed using a Bambu Lab H2D and designed in Shapr3D.
This experiment is inspired by the famous traffic flow experiment by Yuki Sugiyama.
Software for programming the cars: https://pybricks.com/
3D Printer: https://bambulab.com/en/series/h2
BrickController2 (App to use Gamepad with Lego): https://bit.ly/3JypnV0 Where I get my Lego parts from: https://www.bricklink.com/v2/main.page
Music:
Addict (Instrumental) - NEFFEX(1)
The Awakening - Patrick Patrikios
Cherokee Shuffle - Nat Keefe & Hot Buttered Rum
Manic - Jeremy Korpas
Waltz of the Flowers (by Tchaikovsky) - Tchaikovsky(1)
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