Home Email this page Print this page Bookmark this page Decrease font size Default font size Increase font size
Noise & Health  
 Next article
 Previous article
Table of Contents

Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
Citation Manager
Access Statistics
Reader Comments
Email Alert *
Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded16    
    Comments [Add]    

Recommend this journal


Year : 2012  |  Volume : 14  |  Issue : 58  |  Page : 106--112

An investigation on the noise reduction performance of profiled rigid median barriers at highways

1 Department of Occupational Hygiene, School of Public Health and Center for Air Pollution Research (CAPR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Iran
2 Environmental Science, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran

Correspondence Address:
Mohammad Reza Monazzam
Occ Hyg Department, School of Public Health, Tehran University of Medical Sciences, Tehran 13155 119
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1463-1741.97254

Rights and Permissions

Median barriers as a portion of a divided highway are provided to minimize the cross-median crashes. Moreover, median barriers similar to roadside noise barriers could protect people from transportation noise. Thus, there is a need to investigate various median barrier models to identify changes of insertion loss over a simple rigid barrier. In order to estimate the acoustical influence of median barrier's profile in the shadow zone, different median barrier models are presented and their insertion losses are calculated over a frequency range from 50 to 4000 Hz using a two-dimensional boundary element method. The present investigation has clearly revealed that among the profiled median barriers, T-shape, Y-shape, and L-shape provide better performance than that of the other shapes. It is also found that among inclined barriers, V-shape barrier significantly presents higher values of attenuation. Based on the calculation of different geometrics, it has been shown that a further 2 dB (A) in efficiency could be obtained by a better design of the median barrier which is labeled model "L."


Print this article     Email this article