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ADT Calculation (Average Daily Traffic)

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ADT Calculation (Average Daily Traffic)

ADT = total vehicles recorded ÷ number of count days. Extend with seasonal factors separately if you need AADT from short counts.

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What is ADT Calculation (Average Daily Traffic)?

Calculates Average Daily Traffic by dividing total vehicle count by count days; extends to AADT and peak-hour estimates.

ADT Calculation (Average Daily Traffic) Formula / Method

ADT=TotalVehicleCount/NumberofDaysADT = Total Vehicle Count / Number of Days
AADT=AnnualVehicleCount/365AADT = Annual Vehicle Count / 365
AADT=ADT×SeasonalFactorAADT = ADT × Seasonal Factor
PHV=AADT×KPHV = AADT × K
V/C=ADT/CapacityV/C = ADT / Capacity

ADT Calculation (Average Daily Traffic) Worked Example

7daycount=245,0007-day count=245,000
ADT=245,000/7=35,000ADT=245,000/7=35,000
WithSF=0.95,AADT=33,250With SF=0.95, AADT=33,250
WithK=0.10,PHV=3,325With K=0.10, PHV=3,325
Capacity40,000>V/C=0.83Capacity 40,000 -> V/C=0.83

Where ADT Calculation (Average Daily Traffic) Is Applied

  • Highway design
  • Traffic impact studies
  • Pavement design inputs
  • Toll forecasting
  • Urban transport planning

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