Details:

Creators:
Peters, Scott
Corporate Creators:
Illinois Center for Transportation
Corporate Contributors:
Illinois. Department of Transportation. Bureau of Materials and Physical Research
Subject/TRT Terms:
[+]
Air Quality Air Quality Management Automobiles Carbon Monoxide Exhaust Gases Multivariate Analysis
Publication/ Report Number:
FHWA-ICT-08-019 ; FHWA-ICT-08-019, UILU-ENG-2008-2006
FHWA-ICT-08-019 ; FHWA-ICT-08-019, UILU-ENG-2008-2006 Less -
Resource Type:
Tech Report
Geographical Coverage:
Illinois
Corporate Publisher:
Illinois Center for Transportation
Abstract:
The Illinois Department of Transportation (IDOT) currently uses the computer screening model Illinois

CO Screen for Intersection Modeling (COSIM) to estimate worst-case CO concentrations for proposed roadway

projects affecting signalized intersections. The original model was developed as part of the Illinois

Transportation Research Center (ITRC) research project IIIA-H1, FY 97, completed in October 1999. Modeled

results from Version 1.0 and 1.1 of COSIM are based on the U.S. Environmental Protection Agency’s (USEPA)

mobile source emission model, MOBILE5b, and roadway dispersion model, CAL3QHC v 2.0 (Larson, 1999).

The second version of COSIM was released in 2003. Version 2.0 incorporated new emission factor (EF) tables

developed using USEPA’s updated version of the MOBILE model called MOBILE6. In addition to updating the

emission factors used in COSIM, pre-screen criteria for determining when COSIM needs to be used for a

roadway project were developed and incorporated into COSIM as a Pre-Screen feature (Larson, 2003). In

2007, regulatory changes in the Illinois vehicle Inspection and Maintenance (I&M) program prompted the Illinois

Environmental Protection Agency (IEPA) to recommend that IDOT update COSIM with new EF tables using the

MOBILE6.2 model. Based on this recommendation, IDOT and the Illinois Center for Transportation (ICT)

provided funding to update the COSIM model. As part of the update, IDOT also requested that the methodology

used in creating the original Pre-Screen criteria be reevaluated and possibly revised based on the findings of the

evaluation. This report provides technical documentation on the updates and revisions made to Version 3.0 of

COSIM finalized in June 2008.


Format:
PDF
Funding:
R27-7
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:2686adfd1977ac885804172b2df64496a234edbeff512d6772d35e29dbdda6d1
Download URL:
https://rosap.ntl.bts.gov/view/dot/16696/dot_16696_DS1.pdf
File Type:

Supporting Files

• No Additional Files

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