Statistical Analysis of Traffic Counts

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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