In 1926, officials from the State of Colorado revised and amended existing traffic laws. That year, apparently a large number of automobiles were still equipped with hard rubber tires, and mountain driving was a new skill.
On July 9, 1926, The Berthoud Bulletin newspaper reprinted two segments of revised and amended 1926 state highway traffic laws. Meriting special attention was the revision of speed limits.
Section 2 of the new Motor Vehicle Laws of Colorado stated: “No vehicle shall be propelled along or upon any public highway at a speed exceeding thirty-five (35) miles per hour; said maximum speed shall be shall be reduced to twenty (20) miles per hour on all mountain roads; to twelve (12) miles per hour on platted mountain curves; to eighteen (18) miles per hour on all other curves in the case of vehicles weighing more than 10,000 pounds, including their load, unless said vehicle be equipped with pneumatic or cushion tires; and in the case of any vehicle traveling up or down any mountain highway having a grade of 10 per cent or more, said maximum speed shall be reduced to fifteen (15) miles per hour.”…