The variables in traffic effect analysis are listed below with explanation.
Density: Traffic flow density per lane (pcu/km/lane)
Speed: Average spot speed (km/h)
Segment length: length of a segment between two consecutive ramps (km)
Merging volume: traffic volume on the first on-ramp of a segment (100pcu/h)
Diverging volume: traffic volume on the second off-ramp of a segment (100pcu/h)
PLV: Proportion of large vehicles (%)