prop479

What is Prop 479?

shopping cart with $2 purchase times half-cent sales tax equals $2.01

Prop 479 is the continuation of an existing, dedicated half-cent sales tax in Maricopa County to fund transportation. The half-cent sales tax was first established by voters in 1985 with the approval of Proposition 300 and subsequently renewed in 2004 with Proposition 400. Voters approved Prop 479 on November 5, 2024, extending the tax until 2045.

The Prop 479 Investment

The 20-year continuation of the tax is projected to generate $14.9 billion in revenues (2020 dollars).

When compared to a 2050 no-build scenario, the transportation improvements included in the Prop 479 investment plan are projected to:

Reduce the average afternoon commute by 1/3 and reduce congestion by 51,000 hours on critical freight corridors each day.
Increase the number of amenities within a 30- minute drive by 12 percent.
Create $2.4 billion in net new economic activity per year.
Save local businesses $1.6 billion per year in travel time savings and reduced shipping/logistics costs.
Create and support 31,600 jobs per year, more than 70 percent of which are medium and high wage.

The Projects

Search and view projects by phase and project. Use legend on the right side of the map to view the phase years.
Year bands are approximate, and projects may shift based on factors such as environmental studies, labor
availability, supply chain, etc. This map displays the project plans only.

Construction timelines are determined by ADOT. View construction plans and progress on the ADOT website.

The Plan

The Regional Strategic Transportation Infrastructure Investment Plan (RSTIIP) is primarily a financial allocation framework, focusing on how Proposition 479 tax revenues are distributed across modes and geography for the next 20 years.

Freeway Life Cycle Program (FLCP)

Managed by MAG; implemented by ADOT

Arterial Life Cycle Program (ALCP)

Managed by MAG; implemented by local agencies