00968500

Component

https://doi.org/10.3141/1859-09

http://scholar.google.com...rios&publication_year=2003

The results of a project that investigated the effectiveness of in situ noise barriers in Florida are presented. The prediction accuracy of the Federal Highway Administration Traffic Noise Model (TNM) is compared with STAMINA 2.0 and 2.1 (Florida-specific). A total of 20 barrier sites were visited during a 3-year period that resulted in 844 discrete 20-min equivalent sound level (Leq) measurements behind the barriers. Barrier insertion loss was determined using the ANSI indirect barrier method. A methodology was developed to estimate shadow zone length created behind highway noise barriers. All of the barriers tested were effective (>5 dB:LAeq insertion loss at distances equivalent to the first row of homes, where LAeq is the A-weighted Leq) except one site because of marginal additional shielding from a berm barrier combination. Only three sites had an insertion loss of less than 5 dB at distances representative of the second row of homes. Overall, measurements indicate that the barriers provide substantial sound level reduction for residents along the highway. TNM was the best prediction model when considering all test sites; however, the STAMINA models were more accurate at predicting source level. TNM predictions using the Average pavement input overpredicted the reference sound levels measured at these sites. TNM predictions using the OGAC (open-graded asphalt concrete) input were improved (under 2 dB:LAeq of error) over those using the Average pavement type input. This result is expected because Florida uses an open-graded asphalt friction mix.

This paper appears in Transportation Research Record No. 1859, Sustainability and Environmental Concerns in Transportation 2003.

English

p. 72-78

2003

Transportation Research Record

0309085969

Figures (3) ; Photos (1) ; References (4) ; Tables (6)

Accuracy; Asphalt concrete pavements; Computer models; Mathematical prediction; Measurement; Noise barriers; Open graded aggregates; Performance; Sound level; Validation

STAMINA (Computer model); Traffic Noise Model

Insertion loss

Florida

Data and Information Technology; Design; Environment; Highways; I20: Design and Planning of Transport Infrastructure

TRIS, TRB, ATRI

Jan 7 2004 12:00AM

• ABSORPTIVE SOUND BARRIERS: EFFECTS OF THREE POTENTIAL CHANGES TO CURRENT DESIGN STANDARDS OF VIRGINIA DEPARTMENT OF TRANSPORTATION
• ACOUSTICAL ACCEPTANCE TESTING OF PORTLAND (OREGON) INTERNATIONAL AIRPORT GROUND RUN-UP ENCLOSURE
• AVAILABILITY OF TRAVEL FORECASTING METHODS AND DATA FOR AIR QUALITY PLANNING IN DEVELOPING COUNTRIES
• COORDINATED TRANSPORTATION AND LAND USE PLANNING IN THE DEVELOPING WORLD: CASE OF MEXICO CITY
• EQUITY ANALYSIS OF THE HOUSTON, TEXAS, QUICKRIDE PROJECT
• EVALUATING INDIRECT LAND USE AND ENVIRONMENTAL EFFECTS OF A TOLL DISCOUNT PROPOSAL
• FLORIDA'S EFFICIENT TRANSPORTATION DECISION-MAKING PROCESS: LAYING THE TECHNOLOGY FOUNDATION
• JOB ACCESS AND REVERSE COMMUTING INITIATIVES IN CALIFORNIA: REVIEW AND ASSESSMENT
• MAINSTREAMING PRICING ALTERNATIVES IN THE PROJECT DEVELOPMENT PROCESS
• MEASURING ENVIRONMENTAL PERFORMANCE AT STATE TRANSPORTATION AGENCIES
• MEASURING THE ROLE OF TRANSPORTATION IN FACILITATING WELFARE-TO-WORK TRANSITION: EVIDENCE FROM THREE CALIFORNIA COUNTIES
• PERFORMANCE OF NOISE BARRIERS WITH ABSORPTIVE EDGE TREATMENTS
• TRAFFIC NOISE MODEL VS. EXTREME TOPOGRAPHY