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Traffic Density and Flow Calculator — result sheet
Estimate vehicles per kilometre, per-lane density, flow per lane, and average spacing from a road segment observation.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Density = vehicles ÷ segment length; per-lane density = density ÷ lanes; flow per lane = per-lane density × speed; average spacing = 1 ÷ density.
The calculator turns a snapshot or documented segment estimate into common traffic-flow quantities. It keeps segment length, lane count, speed, and vehicle count visible so density is not confused with flow or total traffic volume.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Vehicles on the segment — vehicles; minimum 0; maximum 1000000000
- Segment length — km; minimum 1.0E-6; maximum 1000000
- Number of lanes — lanes; minimum 1; maximum 1000
- Average speed — km/h; minimum 0; maximum 10000
Worked example
| Input | Value |
|---|---|
| Vehicles on the segment | 60 |
| Segment length | 2 |
| Number of lanes | 2 |
| Average speed | 60 |
Density = 30 vehicles/km; per-lane density = 15 vehicles/km/lane; flow = 900 vehicles/hour/lane.
Assumptions and limits
- Vehicle count and segment length describe the same roadway segment and observation period.
- The entered lane count is positive and the vehicles are distributed evenly for the per-lane estimate.
- Speed is an average space-mean-style input compatible with the density observation.
- Spacing is a simple reciprocal estimate and does not model vehicle length or headways.
- Vehicle classes, passenger-car equivalents, queues, ramps, intersections, and time variation are excluded.
- The result is an analytical estimate, not a road-capacity or traffic-safety determination.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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