Study on Shape of Speed Humps According to Speed Limits Using Riding Experiments and Vehicle Vibration Simulation

Abstract

Current technical standards in Japan specify detailed speed hump shapes for roads with a speed limit of 30 km/h; however, there are no technical standards for roads with a speed limit of 40 km/h. In this study, an experiment was conducted to determine the optimal hump shape for roads with a speed limit of 40 km/h. In the driving experiment, the acceleration of a passenger car passing over a hump was measured, and the discomfort of the subject was evaluated using a questionnaire. The jerk was calculated by differentiating the acceleration over time and was used to evaluate the discomfort. In the vehicle vibration simulation, a MATLAB Simulink model developed by Japan Automotive Model-Based Engineering was used to analyze the vehicle vibration. The authors identified a hump shape that causes the same level of discomfort at 40 km/h as at 30 km/h.