Page:Report of Joint Board on Interstate Highways.pdf/63

 recommended by the A. E. S. C. have been adopted. Attention has been paid to the possibility of production in quantity, using either wood, pressed metal, cast steel, cast iron, or cast aluminum. With respect to posts, the committee submits designs using a rolled steal shape, pipe, concrete and wood. The committee makes no recommendation regarding reflecting or luminous signs, assuming only that these shall conform in shape and color scheme with the series of non-luminous signs.

In designing the posts, the pitch and arrangement of bolt holes are so devised that the posts may be made in quantity and any sign may be used on any post without reboring or special adjustment of any kind.

Your committee submits a series of designs which is obviously not complete, but which furnishes samples of practically all signs likely to be used as follows:

(1) Road Marker - The size of this sign has been increased from 13¼ to 15 inches tip to tip vertically, meeting by this change a general criticism of the original design. No other change was made. (2) Left and Right Route Markers - The committee submits these markers in a design similar in outline to the route marker, this, in order that the two may be immediately associated in the mind of the observer. (3) Railroad Sign - This, sign is submitted in two sizes, 24 and 28 inches in diameter, respectively. The 24-inch sign is now widely standardized, being used by both the eastern and western railroad associations and most of the States. This sign, however, because of its shape looks smaller than the other signs, and for that reason a 28-inch alternate design is submitted, without recommendation, for action by the Board. (4) Stop Sign - This sign is submitted as a regular octagon and as an elongated octagon. The Sectional Committee of the A. E. S. C. embodied in its report a recommendation that extension horizontally, as in semaphores, should indicate "stop" and extension vertically should indicate "go." In conference with Dr. Lloyd of that committee, he suggested the elongated octagon as being desirable because it is more closely in accord with the committee's recommendation. These alternates are submitted for the action of the Joint Board. (5) Caution Sign - A series of caution signs of generally uniform design is submitted with recommendation that they be adopted. These signs conform in all details with recommendations of various committees interested in the question of signs. Symbols are used wherever recommended and in the form recommended by such committees.