Map indicating data collection sites for the study.

Implementation of Statistical Analysis Makes IDOT Traffic Counts More Efficient

Last year, ICT completed a project on behalf of the Illinois Department of Transportation (IDOT) to evaluate the feasibility of decreasing the time frame for traffic counts. IDOT had been seeking to extend an existing waiver from the Federal Highway Administration (FHWA) on Highway Performance Monitoring System (HPMS) sections to conduct 24-hour traffic counts instead of the 48-hour counts required by FHWA. These counts are used to determine the average annual daily traffic (AADT) for roads.

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ICT Develops Chloride Reduction Training Program for IDOT Winter Operations

To ensure that the Illinois Department of Transportation (IDOT), local public agencies, and other major users of deicing salts in Illinois have access to information on best practices to minimize the environmental impact of chlorides used for deicing, IDOT commissioned a study by the Illinois Center for Transportation (ICT) to create a chloride reduction training program. One of the major sources of chloride is the road salt used in deicing applications. Chloride has adverse effects on some plants and aquatic biota and may pose a risk to infrastructure and ecosystems.