Route 66 Fine Art photography, for hanging wall art or framed prints. Narrow portion of Rt. 66 with OK shield. One of several sections of the Mother Road known as the Sidewalk Highway because it is only wide enough for one vehicle at a time. Frugal officials were able to build their section of the road twice as long by making it half as wide. Used now as a side road between farms, I had to pull way over onto the shoulder several times to let the local pickup trucks pass.