Impulsivity of Noise due to Single Lightweight Vehicles Transit on Transverse Rumble Strip

N Darus,Z Haron,K Yahya,W.M.A Norudin,M.H Othman,M.A Hezmi,M.H Abd Halil,N Mohamed Noor,A.W Azhari

doi:10.1051/e3sconf/20183402026

Abstract

Transverse Rumble Strips (TRS) acts as safety device that alert inattentive drivers from potential dangers. However, the noise produced due to TRS was reported as noise annoyance among the nearby residents lived adjacent to roadways. Thus, this paper investigates the impulsivity characteristic of noise due to single lightweight vehicles transit on TRS. The objectives of this study are to determine the increase of sound level and to evaluate the impulsivity of noise. Two TRS profiles namely middle overlapped (MO) and middle layer overlapped (MLO) were selected. Three types of single lightweight vehicles which include hatchback, sedan and multipurpose (MPV) were tested at speed of 30, 50 and 70km/h. The sound level was measured using sound level meter (SLM). Noise indices such as LAeq, LAIeqT, LAImax, LAFmax and LASmax were obtained from the measurement. This study considered the differences of LAImax – LAFmax > 2dBA, LAFmax – LAeq ≥ 10dBA, LAIeqT – LAeq ≥ 2dBA and LAImax – LASmax > 6dBA to evaluate the impulsivity of noise. It was found that TRS increased the sound level by at most of 6dBA. Furthermore, all single lightweight vehicles transit on TRS show significant impulsive characteristic. These results proved that TRS produce significant impact to the nearby residents.

Highlights

Transverse rumble strip (TRS) is one of the configurations of rumble strip installed on roadways apart from centreline rumble strip (CRS) and shoulder rumble strip (SRS)
It can be observed that middle overlapped (MO) has significant lower sound level increment with peak level of 2.4dBA as compared to middle layer overlapped (MLO) with peak level of 6.6dBA (MPV)
There are no significant increments for low power engine vehicles such as hatchback and sedan which can be annoyance to the nearby residents. It shows that the overall average increment of LAeq values do not give significant impact when measured with LAeq only

Summary

Introduction

Transverse rumble strip (TRS) is one of the configurations of rumble strip installed on roadways apart from centreline rumble strip (CRS) and shoulder rumble strip (SRS). In Malaysia, TRS is commonly installed with various types of profiles such as middle overlapped, middle layer overlapped and raised rumble strip. It is usually installed at residential or urban area, which acts as one of the countermeasures in reducing traffic accident [1]. It alerts the inattentive and distracted drivers from potential dangers by transmitting sound and vibration through a vehicle. Installation of TRS helps to reduce accidents at pedestrian crosswalks, head-on collision, run off road crashes, fatal crashes and other potential accidents [2,3,4,5,6]

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