The optimization of speed hump design: A case study in Malaysia residential streets

Speed humps have been positively received by local residents in Malaysia but as to date no systematic and ideal guideline were introduce or tested for the effectiveness and were never properly enforced by the local authorities. The purpose of this paper is to develop the 85^th percentile speed reduction in relation to speed hump geometric design. This research paper presents the experimental design of the research and the empirical model to predict 85^th percentile speed reduction in relation to speed hump geometric for residential streets in Malaysia. The speed data measurement is performed on the spot speed data at specified points and location using instrumentation called Pro Laser III Laser Gun Meter Detector. The data are prepared and analyzed using the statistical software called Minitab version 16.0. The geometric parameters such as speed hump height, length and width are used to ascertain the effect of 85^th percentile speed reduction. After several analyses were conducted one model with R-Sq value of 80.6% was developed using multiple linear regressions. If the model using the linear regression analysis is implemented and enhanced into current guideline and standard in Malaysia, it could play an important role in designing or redesigning the speed humps geometric in relation to the desired speed limit for residential streets in Malaysia.