Completed Transportation Studies

ADOT LED Lighting Pilot Study

Completed 2016 - ADOT conducted a pilot program to study lighting and the effects of converting the current lighting system from High Pressure Sodium (HPS) to Light Emitting Diode (LED).

Arizona-Sonora Border Master Plan

Completed 2013 - ADOT and Federal Highway Administration worked collaboratively with the state of Sonora, Mexico, the Secretaria de Relaciones Exteriores, the Secretaria de Comunicaciones y Transportes and several other local, state and federal agencies to develop an Arizona-Sonora Border Master Plan (BMP).

Climbing and Passing Lane Prioritization Study

Completed 2015 - In an effort to enhance safety and mobility on Arizona's roadways, the ADOT worked on updating the 2003 Passing and Climbing Lanes Prioritization Study. This update further refines the identification and prioritization methodology previously utilized and develops a prioritized list of candidate locations that would provide the most benefit to the traveling public.

Corridor Profile Studies

Completed 2017/2018 - ADOT conducted Corridor Profile Studies. The Statewide Map shows all the corridors that were being studied. The studies under this program provide a strategic vision for assessing the overall health of the state's primary highways, assisting the agency with transitioning to a performance-based project programming system through targeted investments.

Interstate 10 from Tangerine Road to Ina Road Study

Completed 2014 - ADOT and the Federal Highway Administration completed an engineering and environmental study of I-10 between Tangerine and Ina roads. The goal for this study was to develop a long-range plan for providing an improved roadway for general traffic, commuters and truck traffic traveling along this portion of the I-10 corridor.

Interstate 19: San Xavier Road to Interstate 10 Study

Completed 2012 - ADOT, in association with the Federal Highway Association, evaluated improvements to I-19 to alleviate congestion and increase capacity within the corridor. The purpose of this project was to evaluate long-term improvements (2030) to I-19 between San Xavier Road and the I-10 / I-19 traffic interchange.

Loop 101 Widening Study: Interstate 17 to Pima Road Study

Completed 2016 - ADOT, in cooperation with the Federal Highway Administration (FHWA), initiated a Design Concept Report (DCR) and environmental study to evaluate the addition of one general-purpose travel lane in each direction on a 13-mile stretch of Loop 101 (Pima Freeway) from I-17 to Princess Drive.

Low Volume State Route Study

Completed 2017 - ADOT conducted this study to evaluate low volume state routes with less than 400 vehicles per day.  The study considered financial constraints, characteristics of the highway, and impact to the local jurisdiction and the regional transportation system to document opportunities and limitations and provide a basis for subsequent prioritized activities for the future management of each route. 

Passenger Rail Study: Tucson to Phoenix

Completed 2015 - During the five-year study, ADOT worked closely with the Federal Railroad Administration (FRA) and other federal agencies, as well as local governments and planning organizations in Maricopa, Pinal and Pima counties, to determine the feasibility of a passenger rail system between Tucson and Phoenix.

Southcentral District Interstate 10 Corridor Ramp Operations Study

Completed 2019 - ADOT conducted this study to determine current and future traffic control needs for the I-10 corridor between Twin Peaks Road and 22nd Street.  The study determined if and when ramp metering infrastructure should be utilized and how it would operate. In addition, the study evaluated the traffic control at the frontage road junctions with the ramps to determine if the systematic "yield" control is appropriate or if "stop" control should be provided.

State Route 86 from Kinney Road to Santa Cruz River Study

Completed 2016 - ADOT, in cooperation with the Federal Highway Administration (FHWA), initiated a corridor study along State Route 86 (SR 86) within the City of Tucson in Pima County, Arizona.

State Route 86 from Sandario Road to Kinney Road Study

Completed 2010 - SR 86 is a regional transportation route connecting the Tucson metropolitan area to the communities of Sells and Ajo and serves the sparsely populated areas in south-central Arizona. In recent years the Tucson urban area has started expanding to the west and SR 86 is a primary link between the expanding urbanized area and downtown Tucson. SR 86 is experiencing a steadily increasing volume of commuter traffic between the developing residential areas to the west and the employment destinations in Tucson.

State Route 89 Chino Valley to Forest Boundary Study

Completed 2017 - ADOT was studying a 13-mile segment of State Route 89 (milepost 328 to 341) between Chino Valley and Paulden to help develop a long-range vision of safety and performance improvements to the corridor.

State Route 89A, State Route 89 to Robert Road Study

Completed 2018 - ADOT and partnering agencies including the Central Yavapai Metropolitan Planning Organization and Yavapai County conducted a transportation planning study along State Route 89A from State Route 89 to east of Robert Road.

US 191 Chinle to Many Farms Safety Improvement Study

Completed 2018 - ADOT completed this study with the intent to develop a vision for safety, operational efficiency and performance improvement for this segment of the US 191 corridor. The study identifies access, mobility, safety and expansion needs and provides a prioritized list of recommended improvement projects.

US 60X Main Street Study

Completed 2018 - ADOT and the Federal Highway Administration (FHWA) initiated a study to assess current and future corridor conditions on Main Street/Apache Trail in order to develop a long-term improvement plan that enhances safety and mobility for all modes of transportation.

US 70, Safford to New Mexico State Line Interstate Detour Needs Study

Completed 2019 - ADOT conducted this study to examine the US70 corridor between Safford and the New Mexico state line for potential engineering or operational improvements to mitigate the hazards posed to drivers during interstate detour events.

US 93 and I-40 West Kingman System Traffic Interchange Study

Completed 2009 - The Arizona Department of Transportation (ADOT), in coordination with the Federal Highway Administration (FHWA), initiated a study process in 2007 to investigate ways for improving traffic flow at the junction of Interstate 40 and US 93 in west Kingman. In January 2019, ADOT began design efforts to implement the study process recommendations.