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Annual average daily traffic (AADT), which represents traffic on a typical day of the year, is used by transportation agencies for reporting requirements, allocating resources, informing decision-making, and supporting various agency functions. NCHRP Web-Only Document 406: Methods for Assigning Short-Duration Traffic Volume Counts to Adjustment Factor Groups to Estimate AADT, from TRB's National Cooperative Highway Research Program, is a supplement to NCHRP Research Report 1124: Guide on Methods for Assigning Counts to Adjustment Factor Groups.