Traffic jams don’t always start with accidents… sometimes, they start with us, and this clever LEGO experiment makes that painfully obvious.

In this video, Youtuber Brick Technology recreates a real-world traffic flow experiment using motorized LEGO trucks driving in a loop. Each vehicle is programmed to behave like a human driver: speeding up, slowing down, hesitating, and before long, everything spirals into a full-blown jam with no obvious cause.

[Via TA]