00756197

Component

https://doi.org/10.3141/1641-08

http://scholar.google.com...Eash&publication_year=1998

Regions that have not attained the National Ambient Air Quality Standard for ozone must demonstrate that their transportation plans and programs conform to a state implementation plan to meet national air quality standards. Vehicle emissions are estimated by metropolitan planning organizations for these conformity evaluations, and the state of the practice is to calculate vehicle emissions from the vehicle distances traveled at different speeds. A highway assignment procedure for air quality conformity has been developed at the Chicago Area Transportation Study (CATS) to provide more detailed estimates of how vehicle distances and speeds vary by time of day and by type of vehicle. The assignment procedure prepares tables of vehicle distances traveled by speed for six classes of vehicles and eight time periods during a typical workday. The eight time period assignments more correctly depict network congestion than the peak/off-peak or average daily highway assignments previously carried out by CATS. The separate vehicle class link volumes reflect the geographic and time period distribution of trips by light- and heavy-duty vehicles. The conformity assignment procedure and the problems encountered in adapting existing highway assignment practices to allow for additional time periods and vehicle classes are outlined. Some conformity assignment results are compared with a daily average assignment to illustrate how the time period assignment procedure affects vehicle emission estimates.

This paper appears in Transportation Research Record No. 1641, Energy, Air Quality, and Fuels 1998.

English

p. 66-72

1998

Transportation Research Record

0309065143

Figures (8) ; References (11) ; Tables (3)

Air quality; Conformity; Estimating; Exhaust gases; Standards; Time intervals; Vehicle classification

Chicago Area Transportation Study

Design; Environment; Highways

TRIS, TRB, ATRI

Nov 13 1998 12:00AM

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• ANALYSIS OF THE COST-EFFECTIVENESS OF MOTOR VEHICLE INSPECTION PROGRAMS FOR REDUCING AIR POLLUTION
• ASSESSMENT OF CAPITAL REQUIREMENTS FOR ALTERNATIVE FUELS INFRASTRUCTURE UNDER THE PARTNERSHIP FOR A NEW GENERATION OF VEHICLES PROGRAM
• COMPARATIVE EVALUATION OF THE COST-EFFECTIVENESS OF 58 TRANSPORTATION CONTROL MEASURES
• DETERMINANTS OF ALTERNATIVE FUEL VEHICLE CHOICE IN THE CONTINENTAL UNITED STATES
• DEVELOPMENT OF AN AGGREGATE FUEL CONSUMPTION MODEL FOR SIGNALIZED INTERSECTIONS
• EMISSIONS REDUCTION POTENTIAL OF THE CONGESTION MITIGATION AND AIR QUALITY IMPROVEMENT PROGRAM: A PRELIMINARY ASSESSMENT
• FREIGHT ENERGY USE DISAGGREGATED BY COMMODITY: COMPARISONS AND DISCUSSION
• FUEL-CYCLE ENERGY AND EMISSIONS EFFECTS OF TRIPLED FUEL-ECONOMY VEHICLES
• HIGH-EMITTING VEHICLE CHARACTERIZATION USING REGRESSION TREE ANALYSIS
• LIGHT-DUTY DIESELS: CONSUMER PERSPECTIVES AND U.S. ENERGY SUPPLY ISSUES
• MODELING ENLEANMENT EMISSIONS FOR LIGHT-DUTY VEHICLES
• PROJECT LEVEL CARBON MONOXIDE HOT-SPOT ANALYSIS FOR LEVEL OF SERVICE D INTERSECTIONS
• REAL-TIME MEASUREMENT OF LEAD IN AMBIENT AIR DURING BRIDGE PAINT REMOVAL
• REDUCING PARTICULATE MATTER AND OXIDES OF NITROGEN EMISSIONS FROM HEAVY-DUTY VEHICLES; THE URBAN BUS CASE