The Arizona Department of Transportation is one of the oldest state agencies dating back to territorial days. At the
time of statehood, it was called the Arizona Highway Department and was managed out of a single office in
Phoenix. In 1955, the Arizona Highway Department created four District Offices. Each District Office was assigned
a region of the state with the duties of constructing and maintaining the roads and bridges within that district.
Even today, this district operational structure is still part of the Department’s organization.
In 1974, the state legislature merged the Arizona Highway Department with the Arizona Aeronautics Department
to form the Arizona Department of Transportation (ADOT). Exhibit 100-2 shows the current organizational
structure of ADOT.
The Transportation Director is appointed by the Governor and leads the Department in implementing
transportation policy mandated by state law. An independent seven-member Transportation Board is the primary
policy-making and governing body for the Department. The Transportation Board determines project priorities,
awards construction contracts, presides over the State Highway System, makes local airport grants, and advises
the Transportation Director on transportation policy matters. The six members are appointed by the Governor and
represent geographical districts in Arizona, with one member serving on an at-large basis.
The Department’s Deputy Director for Business Operations leads seven areas (Administrative Services, Information
Technology, Human Resources, Financial Management Services, Arizona Highways Magazine, Environmental
Services and the Budget, Planning and Research Division). The Deputy Director for Policy provides Transportation
Board support and leads the Public Private Partnership component. The Deputy Director for Transportation (State
Engineer) leads the Intermodal Transportation Division (ITD) and the Multimodal Panning Division (MPD) and other
Groups (See Exhibit 100-3). ITD is divided into several groups. The groups that have the greatest interaction with
construction are Construction & Materials, Bridge, Traffic Engineering, Roadway Engineering, Right-of-way,
Environmental Planning, Project Management, and District Operations.
The key activities of each group and their role in construction are summarized on the following pages.
Construction and Materials Group
The Construction & Materials Group provides support to help districts with managing their construction projects.
This includes providing construction administrative services to supplement the workforce with temporary
technicians, construction administrative services and material testing assistance. Conducting independent review
of workmanship, materials and documentation; providing training for construction and lab technicians;
maintaining instructional guides for construction methods and procedures; providing the services of a Registered
Landscape Architect. Processing monthly pay estimates, quantity documentation, subcontractor approvals.
The Group also consists of Central and Regional laboratories. They maintain AASHTO Accreditation for the State
and provide materials related technical support. Conducts research into construction materials and methods,
develop test methods and specifications, performs testing of soils and aggregates, asphaltic concrete, asphalt
binder, concrete, cement, steel and other structural materials. The Regional Labs are responsible for monitoring
the tests performed by project labs and conducting Independent Assurance and Correlation testing in an effort to
maintain uniform testing procedures statewide.
If the project includes any major structure, such as a bridge or box culvert, the Bridge Group is there to support
ADOT construction personnel by providing technical expertise on structural concrete and structural steel
construction. Usually the Designer is consulted first when plans and details require interpretation. However,
Construction Manual 100 – 4
GENERAL PROVISIONS August 2015
when major specifications changes are needed or when construction and design standards are to be modified, the
Bridge Group should be consulted.
The Bridge Group oversees the inspection of steel sign structure fabrication and sets policy regarding bridge
Traffic Engineering Group
Many construction projects have traffic control, signing, striping, lighting, and/or signalization issues. The Traffic
Engineering Group sets traffic control policy on a statewide basis.
The Traffic Engineering Group reviews all project shop drawings for traffic signals and lighting poles, as well as
electrical submittals regarding lighting, signing, the freeway management system (FMS), and signalization. Traffic
Engineering maintains traffic counts and accident data for the State Highway System.
The Right-of-way Group can be a valuable resource to ADOT’s field construction staff. They maintain right-of-way
(ROW) plans for all roadways and can provide information about property ownership around your project. Rightof-way can tell you what agreements ADOT has with adjacent landowners for temporary access, rights-of-entry,
and construction easements. Information is available on ADOT’s property rights and responsibilities. The Right-ofway Group has a Property Management Section that manages all properties owned by ADOT.
Roadway Engineering Group
This group performs the engineering studies and roadway designs necessary to bring a project from inception to
construction. Engineering consultants perform this function when the Roadway Group lacks the necessary
resources. The Roadway Group develops statewide policies and standards for roadway design and construction
details. Roadway is a great source of information when a change made on the project must conform to current
highway standards. This could involve a change to shoulder widths, stopping sight distances, or guardrail lengths.
Roadway Group publishes the ADOT Construction Standard Drawings (C-Standards).