Abstract
Transverse rumble strips (TRS) are a common choice to reduce vehicle speed and increase driver alertness on roadways. However, there is a potential trade-off using them on rural roadway due to the noise problem created when vehicles go over the strips. The present study investigated the noise level, spectral analysis and the possible noise generation mechanism when the TRS hit by a vehicle. Ten-raised-rumbler (RR) and three-layer-overlapped (TLO) were selected in this study as they have received complaints from the public. Results showed that RR generated relatively higher noise and impulse at low speed, and increased sound level in each octave band. Based on these results, RR may irritate human ears even when the vehicle travels at low speed. It was found that RR increased all noise generation mechanism of tire-pavement interaction whilst for the TLO increased structural resonance, sidewall and surface texture vibration.
Highlights
Motor vehicle accidents are the second most frequent cause of death in the entire world
It is seen that RR increased in noise level by 2.4 dB(A) (3.8%), while TLO only increased by 0.9 dB(A) (3.2%) for the single vehicle speed of 30 km/h
At a vehicle speed of 50 km/h the RR profiles exhibited a similar trend with a higher increase in noise level
Summary
Motor vehicle accidents are the second most frequent cause of death in the entire world. Speeding and careless driving are the two main causes of accidents, contributing 32.8 and 28.2 percent respectively to the total number of accidents in Malaysia [2]. Speeding contributed to about 30 percent of fatal crashes in the United States [3]. Alternative measures consisting of a road layout and its associated features including transverse rumble strips which are able to subconsciously inform drivers of upcoming road conditions were introduced. Transverse rumble strips (TRS) made of a groove or raised lateral pattern are introduced to reduce vehicle speed and increase driver alertness on the roadway. TRS vertically deflects the wheels of a vehicle driving over them and produces both noise and vibration [5]
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