Characteristic Emissions of Heavy Class Intercity Trucks

The heaviest class of intercity trucks is examined using the 1967 Census of Transportation to establish a representative sample of vehicles with truck-miles as the major delineator. Representative road types and vehicle loading factors are selected. Computer simulation of the vehicle and road is used to establish histograms of percent engine load versus engine RPM. The above is then combined with modal emission levels to allow projection on a weighted truck-mile basis, to the entire intercity population of this class vehicle. Heavy class is defined as over 26000 lb. GVW.