37. Two restraining barriers shall be installed, one behind the driver’s station and the other adjacent to the steps, so as to leave a free space of not less than 70 cm between the barrier and the back of the first seat. Those barriers shall comply with the following standards:
(1) they shall be not less than 78.5 cm nor more than 90 cm high measured from the floor;
(2) they shall be capable of withstanding a breaking force of 450 N in any direction;
(3) they shall be equipped, on the upper part, with handrails with a diameter not exceeding 50 mm, including their padding.