Abstract
Transverse rumble strips (TRS) are commonly being installed to alert the drivers through sound and vibration effects. The sound produced affects the existing traffic noise level which caused noise annoyance to the nearby residents. This study aims to assess the traffic noise due to TRS at residential areas by determining the roadside noise levels, traffic and road characteristics and evaluating the relationship between these parameters. Middle overlapped (MO), middle layer overlapped (MLO) and raised rumbler (RR) TRS profiles with same thickness were selected. The measurements of roadside noise levels and skid resistance were conducted using sound level meter (SLM) and British pendulum tester (BPT) respectively. Traffic characteristics were evaluated using previous data measured using automatic traffic counter (ATC). In overall, MLO produced highest roadside noise levels with increase of 20.5dBA from baseline. Generally, the increase of roadside noise level due to TRS is strong with speed, weak to medium with skid resistance of TRS and no relationship with traffic volume. Based on three TRS profile types, MLO is not suitable to be installed on the roadways adjacent to the residential areas as the increase of roadside noise level is significant which is more than 5dBA compared to MO and RR.
Highlights
The types of rumble strips are characterized by the position being installed on the roadways such as transverse, shoulder and centerline
The most common transverse rumble strips (TRS) profile types are middle overlapped (MO), middle layer overlapped (MLO) and raised rumbler (RR) which generate different sound level can affect the residents lived adjacent to the roadways
The results show that the TRS has increased the sound level indices LAeq, L10, L90 significantly and there are changes in traffic noise index (TNI) which indicate dissatisfaction
Summary
The types of rumble strips are characterized by the position being installed on the roadways such as transverse, shoulder and centerline. TRS profile designs are uniform over the country according to the local authorities [3,4,5]. These guidelines are very basic which resulted in different TRS designs in term of dimension and profile. The most common TRS profile types are middle overlapped (MO), middle layer overlapped (MLO) and raised rumbler (RR) which generate different sound level can affect the residents lived adjacent to the roadways. Nowadays, living environment in many residential areas have been deteriorating due to the increase in traffic volume which resulted in noise annoyance to the nearby residents.
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