Pipe-Stream : no more FIFO on multi-lane roads

One blocked motorway exit, the same traffic, three traffic models. Where does the queue go? • Strict FIFO (single stream, classic CTM diverge): the exit queue holds up every lane. Lanes 2 and 3 stop in front of an empty road, and the jam spills back across the whole motorway. • Relaxed FIFO: through traffic passes, but the exit queue has no length. It piles up at the node instead of spilling back upstream. • Pipe-Stream: each lane group is its own kinematic-wave stream, a pipe. Pipes chain across nodes, so the queue stays in its lane and spills back correctly, while through traffic keeps moving. A single friction coefficient φ slows the neighbouring lanes when a pipe is full (late lane changes, rubbernecking). Chapters 0:00 One blocked exit 0:10 Strict FIFO 0:20 Relaxed FIFO 0:31 Pipe-Stream 0:44 Three models, three answers The vehicle animations are illustrative (car-following model applying each rule). Code: https://github.com/AureClai/stream-pipes-rust Preprints (Zenodo): https://shorturl.at/Vuw0t https://shorturl.at/o2NR9 How the event-based model works:    • How a meso event-based traffic model works ?   #TrafficModeling #TrafficSimulation Video made with Claude