197. The seat or bench of a motorized vehicle used for the transport of workers shall have:(1) a minimum width of 460 mm (18.1 in) per place;
(2) a height of between 380 mm (15 in) and 480 mm (18.9 in) above the floor;
(3) a minimum depth of 300 mm (11.8 in);
(4) a back rising at least 500 mm (19.7 in) above the level of the seat or bench, unless it rests against the slatted sides or the walls of the vehicle.