International Transaction Journal of Engineering,Management, & Applied Sciences & Technologies
Dulyachot Cholaseuk, Pornprom Pahubutra, "A Road Test Study on Speed Sensitive Collapsible Mechanical Speed Bump", Vol. 11(1), p1-8, Nov. 2019
A speed sensitive collapsible mechanical speed bump is a structure of a triangular shaped profile with joints that allow the bump to fold flat. The operation of the bump relies on an all mechanical system that uses a pendulum as a speed sensor. The amount of angular motion of the pendulum varies with the speed of the vehicle passing. This determines the position of the tip of the pendulum that contacts the guide rail, which
can control the pendulum to fold or to lock. The speed bump is designed to lock when a vehicle passes at speed above 8 km/hr and to fold flat at the speed below 8 km/hr. This road test version was vastly improved
from the conceptual prototype. The pendulum speed sensing mechanism was separated from the locking mechanism to ensure speed sensing accuracy while improving strength in the locking position. Overall
profile was scaled down to fit Thailand’s speed bump standard. Testing was conducted with six vehicles of different segments: an eco car, two compact sedans, two mid-size suv’s and a pick-up truck. The test results
show that the bump response well with the transition range of 7 – 12 km/hr.