50mm speed bumps by HIPHEN SOLUTIONS Speed humps are parabolic vertical traffic calming devices intended to slow traffic speeds on low volume, low speed roads. Speed humps are 3–4 inches high and 12–14 feet wide, with a ramp length of 3–6 feet, depending on target speed. WE CAN INSTALL IN ANYWHERE IN NIGERIA OFFICES IN LAGOS, ABUJA, PORT HARCOURT AND BENIN C...