Traffic Density Calculator

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The fundamental equation is: Flow = Speed x Density. Pick what you want to find and supply the other two values.
Count of vehicles occupying the road segment at one instant in time.
vehicles
Length of the road section being studied.
km
Total lanes in the direction of travel. Used to compute per-lane density for LOS grading.
lanes
Traffic densityLOS D - Approaching unstable
40

Vehicles per unit length of road

Density per lane20
Average headway25
Level of serviceLOS D - Approaching unstable
20 veh/km/lane
LOS A<7LOS B7-11LOS C11-16LOS D16-22LOS E22-28LOS F28+

Density: 40.00 veh/km - LOS D - Approaching unstable

  • Traffic density is 40.00 veh/km - Approaching unstable.
  • Average spacing between vehicles is about 25.0 m bumper-to-bumper.

Next stepLOS D/E signals congestion approaching capacity. Consider demand spreading, signal coordination, or additional lanes if this persists during peak hours. Enter a speed to also compute flow using the fundamental equation: Flow = Speed x Density.

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