Multi-luminance mobility test sample layout. Obstacles include two raised steps with arrows (2 in. high), two grass tiles, three black tiles representing holes, two elevated foam blocks (4.5 in. high), two Styrofoam (STY) cones, one stop sign (adjustable from 40 to 72 in. high), one step-over obstacle (9 in. high), one waist-high obstacle (represented by the blue tree, 27 in. high) and one waste basket (13 in. high).