00460101

Component

http://onlinepubs.trb.org...trr/1986/1058/1058-003.pdf

https://scholar.google.co...nnor&publication_year=1986

In this paper the method, analysis, and results are presented of a study to determine the traffic noise field near and surrounding a highway tunnel portal. The purpose of the study was to determine how the increase in noise due to reverberations in a tunnel affects noise levels immediately outside a tunnel. An array of sound-level meters measured the traffic noise simultaneously at various locations near a tunnel portal. The results are given in terms of the statistical noise descriptors L10, L50, and L90. Graphic plots of distance from the tunnel portal versus decibel level are presented. Measurements were taken on top and in front of the tunnel portal. The results indicate that for measurement sites on top of the tunnel, the drop-off in sound level is very abrupt and at 30 to 40 ft (9 to 12 m) behind the portal the traffic noise has diminished to the ambient noise levels of the surrounding area. For sites in front of the tunnel portal, the drop-off rate is less abrupt than that for the sites on top but still rapid and reaches normal free-field traffic noise levels at 60 to 70 ft (18 to 21 m) from the portal.

Publication of this paper sponsored by Committee on Transportation-Related Noise and Vibration. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01419462

pp 14-17

1986

Transportation Research Record

0309040523

Digital/other

Figures (6) ; Maps (1) ; Photos (2) ; References (2) ; Tables (1)

Building entrances; Distance; Reverberation; Sound level; Traffic noise; Tunnels

Bridges and other structures; Highways; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB

Nov 30 1986 12:00AM

• A METHODOLOGY FOR ASSESSING HIGHWAY TRAFFIC NOISE IMPACTS IN AN AIRPORT ENVIRONMENT
• ANALYZING CONSTRUCTION NOISE BY A LEVEL/DURATION WEIGHTED POPULATION TECHNIQUE
• CONSIDERATIONS FOR MODELING OF AIRCRAFT NOISE
• EVALUATION OF THE CALINE4 LINE SOURCE DISPERSION MODEL FOR COMPLEX TERRAIN APPLICATION
• HEAVY-TRUCK NOISE EMISSION LEVELS ON GRADES IN CALIFORNIA
• NOISE EMISSION LEVELS FOR VEHICLES IN ONTARIO
• TRAFFIC FLOW AND AIR QUALITY IN A MOUNTAIN COMMUNITY
• TRAFFIC-RELATED NOISE AS A FACTOR IN EMINENT DOMAIN PROCEEDINGS IN FLORIDA