― from Popular Science, December 1917, page 908.
Many motor routes have been opened up across the continent during the past few years. One of the most popular of these has been designated “The Arrowhead Trail,” and the trail for a part of the way—that portion which passes through passes through San Bernardino, California—has been “blazed” by lamp posts in arrowhead design.
The arrowhead lamp posts were made simply by cutting off the top of the ordinary street lamp posts and substituting a wooden arrowhead, on top of which the regular electric lamp was placed. The arrowhead structure contains sixteen incandescent globes of a buff tint to represent the rocks of the trail. These in conjunction with the large light at the top of the post make the trail brilliant through the streets of the city at night, advertising the route.