About MAG

Maricopa Association of Governments (MAG) is the long-range planning agency for the metropolitan Phoenix region. MAG includes 27 cities and towns, three Native nations, Maricopa County, and portions of Pinal County.  MAG helps bring our region together to address issues of regional significance and work collaboratively to identify mutually beneficial solutions.

Riders on public transit smiling

MAG is responsible for leading regional transportation planning and identifying the solutions and strategies that will support the economic vitality of the region.

What is Proposition 300?

Proposition 300 was a 20-year, half-cent sales tax overwhelmingly passed by Maricopa County voters (72 percent) on October 8, 1985. Revenues from Proposition 300 were used to fund regional freeway investments including the Loop 101, portions of Loop 202, and State Route 51, Piestewa Freeway.

Proposition 300 went into effect on January 1, 1986, and collections expired on December 31, 2005.

Image credit: Arizona Department of Transportation

Valley Metro paratransit driver helps rider off public transit

What is Proposition 400?

Proposition 400 is a 20-year continuation of Proposition 300, approved on November 2, 2004 by the voters of Maricopa County.

This current half-cent sales tax extension went into effect on January 1, 2006, and collections will expire on December 31, 2025.

Where do Proposition 400 funds go?

Funds collected from the half-cent sales tax fund transportation projects in Maricopa County. As required by law, 56.2 percent of all sales tax collections are distributed to freeway and highway improvements; 10.5 percent are distributed to arterial street improvements; and 33.3 percent are distributed to transit improvements.

Freeway Life Cycle Program

Managed in partnership by the Maricopa Association of Governments and Arizona Department of Transportation and implemented by the Arizona Department of Transportation.

Arterial Life Cycle Program

Managed by the Maricopa Association of Governments and implemented by local jurisdictions.

Transit Life Cycle Program

Managed and implemented by Valley Metro (Regional Transportation Authority).