This study investigated whether highways acted as barriers to gene flow for pronghorn in northern Arizona. DNA samples from 132 pronghorn were analyzed using eight polymorphic microsatellite loci. Samples represented animals living on opposite sides of US Route 89 (US 89) and State Route 64 (SR 64). Two different modeling approaches indicated that both US 89 and SR 64, and to a lesser extent US Route 180 (US 180), acted as barriers to gene flow. The genetic structuring caused by highways, especially across US 89, is consistent with behavioral data that demonstrated pronghorn rarely cross this highway. This study found no evidence of inbreeding or reduced genetic variation in any of the populations examined, but those effects may take longer to appear. Based on these results, the researchers recommend future genetic monitoring of these populations or assessment of genetic variation across highways with larger traffic volumes or longer histories to determine whether the barrier effects documented here lead to loss of genetic diversity.

The Arizona transportation history project was conceived in anticipation of Arizona’s centennial, which will be celebrated in 2012. Following approval of the Arizona Centennial Plan in 2007, the Arizona Department of Transportation recognized that the centennial celebration would present an opportunity to inform Arizonans of the crucial role that transportation has played in the growth and development of the state.

The report consists of a historical narrative and a series of topical essays. The seven-chapter historical narrative is a history of Arizona’s highways that extends from the pre-Columbian era to the present. The 14 topical essays extend the scope of the history beyond the state’s highway system. They include overviews of the development of other transportation modes (railroads, aviation, and urban transit), a brief history of highway pavements, a lighthearted look at the motoring experience during the 1920s and 1930s, and an exploration of how changes in transportation infrastructure affected some Arizona communities. The topical essays also provide additional historical information on bridges, urban freeways, the Interstate system, ADOT and its predecessor agencies, and famous roads such as U.S. Route 66, U.S. Route 89, the Black Canyon Highway, and the Beeline Highway.

The report also includes a timeline of transportation-related developments. This chronology not only provides an accessible overview of Arizona’s transportation history; it also places that history in a larger context by including transportation-related developments from the rest of the nation and around the world. Finally, the report contains a guide to archives in Arizona that hold significant collections of historical photographs related to the state’s transportation history, a bibliography of published historical sources related to the history of highways in Arizona, and a discussion of how the historical narrative and topical essays could be used to produce publications and media that would be made available to the public.

Some freeway users complain that new freeway segments fill up with traffic during peak hours immediately after construction. Because of this concern, the debate about the costs and benefits of freeways often centers on relieving congestion. The literature states that the long-term relief of congestion is an elusive goal. While congestion is a pervasive feature of freeways, it does not mean that constructing them is useless. This study helps to demonstrate that the great benefit of freeways is to facilitate travel rather than reduce peak-hour congestion. The study finds that the facilitated travel far outweighs the cost of freeway construction. Even if new freeway capacity becomes congested during peak travel hours, there is still great benefit in the increased travel mobility that can be accommodated.

This report follows The Coming of Age report produced in 2002 by some of the principals involved in this project, and published by St. Luke’s Health Initiatives. That research showed that Arizona had much to do to get ready for the baby boomer age wave. The results of Unlocking Resilience from new survey data, interviews, and secondary research indicates Arizona still has much to do to prepare for aging and must make concrete policy decisions about aging.

Though the Great Recession may be officially over, all is not well in Arizona. Three years after the collapse of a massive real estate “bubble,” the deepest economic downturn in memory exposed and exacerbated one of the nation’s most profound state fiscal crises, with disturbing implications for Arizona citizens and the state’s long-term economic health.

This brief takes a careful look at the Grand Canyon State’s fiscal situation, examining both Arizona’s serious cyclical budget shortfall—the one resulting from a temporary collapse of revenue due to the recession—as well as the chronic, longer-term, and massive structural imbalances that have developed largely due to policy choices made in better times. This primer employs a unique methodology to estimate the size of the state’s structural deficit and then explores the mix of forces, including the large permanent tax reductions, that created them. It also highlights some of the dramatic impacts these fiscal challenges are having on service-delivery as well as on local governments. The brief suggests some of the steps state policymakers must take to close their budget gaps over the short and longer term. First, it urges better policymaking, and prods leaders to broaden, balance, and diversify the state’s revenue base while looking to assure a long-haul balance of taxing and spending. And second, it recommends that Arizona improve the information-sharing and budgeting processes through which fiscal problems are understood—so they may ultimately be averted.