United States Department of Transportation
i
Carbon monoxide screen for signalized intersections : COSIM, version 4.0 - technical documentation.
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2013-06-01
[PDF-137.56 KB]
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Abstract:Illinois Carbon Monoxide Screen for Intersection Modeling (COSIM) Version 3.0 is a Windows-based computer
program currently used by the Illinois Department of Transportation (IDOT) to estimate worst-case carbon
monoxide (CO) concentrations near signalized intersections in Illinois. Modeled results from COSIM are based
on the U.S. Environmental Protection Agency’s (EPA’s) mobile source emission model, MOBILE6.2, and
roadway dispersion model, CAL3QHC v 2.0. Emission factor (EF) tables derived from MOBILE6.2 are
incorporated directly into COSIM’s program coding. Recent regulatory changes in mobile source emissions
modeling have prompted IDOT to update the EFs used in COSIM with EFs estimated using EPA's Motor Vehicle
Emission Simulator (MOVES) mobile source emission model. This report documents the changes made to
COSIM, Version 3.0, that allow IDOT to continue to use COSIM (Version 4.0) to estimate worst-case CO
concentrations for proposed roadway projects with signalized intersections in 2013 and beyond.
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