Microscopic Traffic Simulation Calibration Level for Reliable Estimation of Vehicle Emissions

Table 1

Vehicle type composition in NGSIM data.

Vehicle type	1^st 15-min interval		2^nd 15-min interval		3^rd 15-min interval
	Vehicles	Percentage	Vehicles	Percentage	Vehicles	Percentage
Motorcycle (Gasoline)	30	1.4%	10	0.5%	5	0.3%
Passenger car (Gasoline)	2,086	96.2%	1,963	97.3%	1,870	97.6%
Truck and bus (Diesel)	53	2.4%	44	2.2%	40	2.1%