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Traffic in many parts of the world is heterogeneous, where road space is shared
among many traffic modes with different physical dimensions.
Loose lane discipline prevails; car following is not the norm.
This complicates computing of PCU.
Some of the methods for determining passenger car units (PCU) are following:
- Modified Density Method
- Chandra's method
- Method Based on Relative Delay
- Headway method
- Multiple linear regression method
- Simulation method
It may be appropriate to use different values for the same vehicle type
according to circumstances like volume of traffic, speed of vehicle, lane width
and several external factors.
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