// multi-utility computation suite · offline · instant · precise
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eng.traffic-flow-Greenshields Calculator
Calculates traffic flow parameters (speed, density, flow) using the Greenshields linear speed-density model. The Greenshields model predicts flow as a parabola of density — maximum flow (capacity) occurs at half of jam density.
Inputs
K Density Veh Km
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Kj Jam Density
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Uf Free Speed Km Hr
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
traffic speed u (km/h)
The computed rate of movement or processing.
traffic flow q (veh/hr)
Reference formula or conversion factor shown for context.
maximum flow q_max (veh/hr)
The largest value in the dataset or feasible range.
optimal density k_opt (veh/km)
Sample size or count used in the calculation.
u = uf(1-k/kj)
Reference formula or conversion factor shown for context.
LOS
LOS (length of stay) -- the number of days from admission to discharge. A key hospital efficiency metric.