The I-10 expansion project is being developed to provide additional capacity between Sarival Avenue and Loop 101. The freeway expansion includes both adding outside lanes and widening the median to improve east/west traffic flow in the West Valley.

Planned projects include inside widening, outside widening and interchange construction as displayed on the project map below.

For more information on select a specific segment. A printable version is available.

Approval by voters in the general election on November 2, 2004 ensured that the half-cent sales tax for transportation would extend for an additional 20 years to 2026 to implement the Regional Transportation Plan.


The planning stage establishes the general location and basic characteristics (number of lanes, interchanges, etc.) of a roadway. Accompanying this are environmental studies (noise, traffic volume, etc.), identification and evaluation of alternatives, general cost estimates, partnering with public and private partners, and the determination of feasibility to move to the design phase.

The timeline represents steps in the process for roadway improvement to evolve from an idea to construction completion. There are a series of studies that are required before a roadway gets built. Once built, a roadway will continually be improved over time as a result of the studies.

The design of a roadway involves several phases of detailed engineering and technical review and interim levels of approval. The final design of the roadway is represented in plans and specifications that construction contractors use to prepare construction bids.

ADOT continually plans for additional improvements to the roadway for maximum efficiency and safety. Various studies identify these improvements and may influence additional planning, design and construction. Ongoing studies for Interstate 10 (Papago Freeway) are shown on the Current Studies page.

The improvements to Interstate 10 (Papago Freeway) reflected herein are funded with the half-cent sales tax under the voter-approved Proposition 400. In 2003, the Maricopa Association of Governments approved the $15 billion Regional Transportation Plan that included funding for improvements to Interstate 10. In April, 2006, the mayors of cities within Maricopa County voted to approve the acceleration of improvements to Interstate 10.

Our Valley Freeway System is part of the 2004 voter-approved Regional Transportation Plan. We are working hard with our transit partners to implement the voters’ vision and are committed to quality, safety, open communication with our neighbors, and minimal inconvenience to the traveling public.