TAS 4.5.4 Gratings. If gratings are located in walking surfaces or along accessible routes, then they shall have spaces no greater than 1/2 in (13 mm) wide in one direction (see Fig. 8(g)). If gratings have elongated openings, then they shall be placed so that the long dimension is perpendicular to the dominant direction of travel (see Fig. 8(h)).
While not specifically forbidden to be in the accessible route as shown below:
The must however have spaces no greater than 1/2 in (13 mm) wide in one direction. The image below is a violation of TAS 4.5.4:
and the long dimension must comply.