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TNMAide -- for use in the FHWA's Traffic Noise Model (TNM) -- is a spreadsheet tool that aids in the determination of the worst noise hour of the day, as required by 23 CFR 772. The U.S. Department ofTransportation recently designated 44 infrastructure projects around the country as Infrastructure for Rebuilding America (INFRA) Extra -- a designation that makes project sponsors eligible to apply for credit assistance for up to 49 percent of project costs. FHWA Releases Air Quality and Noise Analysis Tools In 2021, the Federal Highway Administration developed the Database for Air Quality and Noise Analysis (DANA) tool. [Extracted from the article]

A new mathematical model is proposed to estimate road traffic noise at sites along a freeway where the traffic volume fluctuates from a maximum of 900 vehicles per hour in the daytime to a minimum of 300 vehicles per hour at night. The model considers traffic conditions such as the percentage of heavy vehicles, time interval between successive (two or more) heavy vehicles and measurement time interval. The A-weighted equivalent continuous sound pressure levels calculated from this model are in keeping with measured ones at several representative time intervals both in the daytime an nighttime. [ABSTRACT FROM AUTHOR]