The name "National Old Trails Road" was officially dropped from US 66 in Arizona by December 1927. Immediately, the counties US 66 traveled through in northern Arizona began campaigning for the highway to be fully paved. In the middle of 1928, numerous bond issues passed by cities, states and the federal government were allocated to help begin paving work on US 66 across the nation, including a large portion of the route within Arizona. The total sum of the multiple bond issues was $41 million (equivalent to $ in ). To further supplement the cost of paving US 66, $150,000 was (equivalent to $ in ) raised by the U.S. Highway 66 Association on June 7, 1928. Extensive preparation work in the form of multiple aerial surveys and a detailed study regarding finances and local construction logistics was also undertaken to aid in paving through Arizona.