United States Department of Transportation
i
TNM Noise Analysis of Central H-1 Freeway
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2014-04-04
[PDF-3.25 MB]
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Edition:6/11 to 3/14
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Abstract:The purpose of this project was to provide a comprehensive first-time assessment of noise levels along the central part of the H-1 Freeway. The noise analysis tool used was FHWA’s Traffic Noise Model (TNM, version 2.5). Analyses of both existing (year 2012) conditions and with a 10 ft. noise barrier were conducted for three time periods: 6:00-7:00 AM was selected to represent worse noise conditions during the AM peak period; 5:00-6:00 PM was selected to represent worse noise conditions during the PM peak period; and 7:00-8:00 PM was selected to represent worse night time noise conditions. The latter period has relatively high volumes and high speeds. After 8 PM speeds are high but volume becomes low, thus estimates of noise are lower in magnitude. The 7-8 PM hour is the preferred period for assessing annoyance from highway noise along this corridor. Results: 17% of the segments or 1.08 out of 7.66 miles of central H-1 Freeway examined in this analysis have traffic noise levels below the FHWA Noise Abatement Criteria (NAC), that is, below the level that requires noise abatement; 48% or 3.83 miles have a noise level above the NAC that can be mitigated using 10 ft. noise barriers; 31% or 2.44 miles have a noise level above the NAC that cannot be mitigated using 10 ft. noise barriers because the receptors are located at an elevation over 10 ft. above the roadway; and, 3% or 0.32 miles have a major traffic noise problem that would require tall barriers (well over 10 ft.) to mitigate. In mid-2014 a large portion of the subject freeway from Middle St. to Punahou St. was widened from 3 to 4 lanes per direction rendering most of the results herein approximate, at best.
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