D.2.4 Attention TWSIs shall be set across the entire width of a blended curb’s edge (exclusive of flares) and set back 150 mm to 200 mm from the curb’s edge, and they shall extend a minimum depth of 610 mm in the direction of travel. [...] - Barrier-Free Design Guide - Fifth Edition - Note: If the curb ramp is located in front of the stall, the vehicle will block Summer 2017 access to the curb ramp, which is a part of the barrier-free path of travel. [...] The long dimension of the openings shall be perpendicular to the path of travel. [...] A variety of middle and end armrests and or handles shall be provided to push off of and keep balance. [...] D.6.3 The seat height shall be between 450 mm and 500 mm from the ground and the depth of the seat shall be between 400 mm and 450 mm.