LWR TRAFFIC FLOW MODEL

Lighthill-Whitham-Richards PDE: ∂ρ/∂t + ∂(ρV(ρ))/∂x = 0 — shock waves and rarefaction fans in traffic
Density ρ(x,t) — red = congested, green = free flow. Click/drag to add cars.
Fundamental Diagram: Flow q = ρ·V(ρ). Working point shown in yellow.
Space-time diagram — darker = higher density. Shock waves appear as diagonal discontinuities.