Work out traffic volume count instantly with clear inputs, formula shown and shareable results.
Mixed traffic is converted to passenger car units so that capacity comparisons are meaningful: a two wheeler occupies about half the road space of a car and a truck about three times as much. Dividing by the count duration gives the hourly flow rate used in capacity and level of service analysis.
Passenger car units
PCU = cars x 1.0 + two wheelers x 0.5 + heavy vehicles x 3.0
Flow rate
PCU per hour = total PCU / count duration in hours
PCU = cars x 1.0 + two wheelers x 0.5 + heavy vehicles x 3.0. Mixed traffic is converted to passenger car units so that capacity comparisons are meaningful: a two wheeler occupies about half the road space of a car and a truck about three times as much.
Considerably, with speed, gradient, lane width and the degree of segregation. Published factors differ between countries and should be taken from the local capacity manual.
This calculator takes 4 inputs: Cars and light vehicles counted, Two wheelers counted, Buses and trucks counted, Count duration. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.