. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. TRANSPORTATION TRANSPORTATION The transportation category of CTAP consists of highway vehicles â trucks, buses, motorcycles and automobiles; rail carrier â passenger and freight; air travel â airplanes and jets; and water traffic â recreation and freight. HIGHWAY VEHICLES Within the transportation category, highway vehicles emit the majority of air pollutants, primarily nitrogen oxides (NOx), volati
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. TRANSPORTATION TRANSPORTATION The transportation category of CTAP consists of highway vehicles â trucks, buses, motorcycles and automobiles; rail carrier â passenger and freight; air travel â airplanes and jets; and water traffic â recreation and freight. HIGHWAY VEHICLES Within the transportation category, highway vehicles emit the majority of air pollutants, primarily nitrogen oxides (NOx), volatile organic compounds (VOCs) and carbon monoxide. The level of emissions depends on the vehicle miles traveled (VMT), the types of vehicles and their emission rates, the fuels used, the emissions standards set by government, and a variety of other factors. This section looks at trends in VMT, vehicle emission rates and highway emis- sions. Vehicle Miles IVaveled (VMT) The rate of VMT growth in different parts of the state has varied significantly. During the 1973-82 period, when statewide VMT grew by 8%, the MSA's (urban areas) outside of the metropolitan Chicago area actually decreased travel while the Chicago collar counties, experiencing tremendous economic growth, increased VMT nearly 20%. In the 1982-1991 period, when statewide VMT grew 30%, VMT in the balance of the state (non-MSA counties) grew more slowly at 21%, while VMT in the Chicago suburbs grew by nearly 50%.. Collar Counties D 1982-91 â 1973-82 Figure 2. Percent change in VMT. The number of vehicle miles traveled in Illinois has grown steadily during the past twenty years. State- wide VMT grew from 61 billion miles in 1973 to 86 billion miles in 1991, an increase of 41% (Figure 1). The only exceptions to this general pattern of growth are the 1974-75 and 1979-82 periods when rapid oil price increases and recessions stifled VMT growth. Despite the oil price "shocks" experienced during the 1973 - 1982
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