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 Statewide ITS Architecture

Completed 2018 - This project updated the Statewide Intelligent Transportation System (ITS) Architecture for the State of Arizona.  The Statewide Architecture provides a common framework for planning, defining, and integrating intelligent transportation systems over the next 10 years and reflects the contributions of a broad cross section of the ITS community. 

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).

Central District Freeway Frontage Road Traffic Control Study

Completed 2021 - ADOT completed the study to assess the needed traffic control at the junction of freeway off ramps and frontage roads. The study analyzed 65 locations and developed recommendations for stop, yield and no traffic control on one and two lane frontage roads based on crash history, traffic volume, roadway geometrics and posted speed limits. The study recommendations provide general traffic control guidance that will be further evaluated based on the unique needs of each project location on a case by case basis.

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 / Houghton Traffic Interchange Study

Completed 2021 - The Arizona Department of Transportation (ADOT), in partnership with the Federal Highway Administration (FHWA), initiated a design concept study and related environmental studies to evaluate an interchange reconstruction at Houghton Road and Interstate 10 in Tucson, Arizona.

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 10 Inner Loop: Active Traffic Demand Management Planning Study

Completed 2020 - Interstate 10 is a major interregional and interstate freeway providing direct access to downtown Phoenix. The Inner Loop of I-10 spans between the I-10/I-17 Stack Interchange and the I-10/I-17 Split Interchange. This study encompassed the I-10 Inner Loop and extended from 35th Avenue to Sky Harbor Boulevard with an emphasis on the Deck Park Tunnel.

Interstate 10, Phoenix to California Border Multimodal Corridor Study

Completed 2013 - ADOT completed the study to assess the Interstate 10 corridor as a highway and as a travelshed to formulate a multimodal transportation plan that identifies a clear vision of the transportation roles of the corridor with respect to mobility.

Interstate 19 East Frontage Road Study from Ruby Road to Rio Rico Drive

Completed 2018 - In 2012, the Arizona Department of Transportation and the Federal Highway Administration began working on a study to enhance traffic flow at the I-19 and Ruby Road traffic interchange and along the I-19 east frontage road from Ruby Road to Rio Rico Drive.

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.

Interstate 40 from Bellemont to Winona

The Arizona Department of Transportation and the Federal Highway Administration are conducting engineering and environmental studies to develop a long-range plan for the improvement of the I-40 corridor west of the Bellemont traffic interchange (TI) to east of the Winona TI.

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 238 Drainage Study

Completed 2020 - This study was located on State Route (SR) 238 in ADOT’s Central District. The study began at milepost (MP) 24.00 and ended at the intersection of SR 347 at MP 44.24 in the City of Maricopa.

State Route 260 from Overgaard to US 60 Study

In 2010, the Arizona Department of Transportation, in coordination with the Federal Highway Administration and the Apache-Sitgreaves National Forest, completed an Initial Location / Design Concept Report on SR 260 from east of Overgaard at milepost 309.4 to the intersection of US 60 in Show Low at milepost 340.1. The Initial Location / Design Concept Report evaluated multiple alternatives to improve traffic flow and safety. Due to lack of funding, the project was canceled.

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.

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