11. In the case of a bus there shall be fitted as near as practicable to the gas container a valve which shall stop the flow of gas into the gas supply pipeline in the event of—
(a)the angle of tilt of the vehicle exceeding that referred to in regulation 6 of the Public Service Vehicles (Conditions of Fitness, Equipment, Use and Certification) Regulations 1981(1), and
(b)the deceleration of the vehicle exceeding 5g.
To which there are no relevant amending instruments.