Colorado voters will decide on Initiative 175 on Nov. 3, 2026. The Colorado secretary of state's office certified the measure for the ballot on June 23, 2026, after proponents submitted 143,112 valid signatures, exceeding the minimum requirement of 124,238.

Initiative 175 would add a new section to Article X of the Colorado Constitution, requiring state and local governments to spend state revenue collected to support road transportation on specific uses. These include the construction, maintenance, and operation of public streets, roads, highways, or bridges; the development and improvement of safety measures for motor vehicles traveling on these thoroughfares; the design, engineering, and management required for road transportation; and support for the Colorado State Patrol.

The initiative defines state revenue collected to support road transportation as all sales and excise taxes on motor vehicles and fuel, along with two-thirds of the sales and use taxes on motor vehicle parts, equipment, and accessories that are affixed to a vehicle. Under the measure, the state would allocate collected revenue among local governments and the state highway fund.

In response, the Colorado General Assembly passed House Bill 26-1430 on May 13, 2026. Governor Jared Polis signed the bill into law on June 4, 2026. If voters approve Initiative 175, House Bill 26-1430 would temporarily lower fuel taxes, vehicle registration fees, road-safety surcharges, and road-usage fees for four years.

House Bill 26-1430 also creates a new fund for revenue that Initiative 175 would require to be spent on roads. Under the bill, some money directed to roads would replace funding the state already provides through the General Fund, rather than increasing total road funding. The Colorado House of Representatives approved the bill by a 42-22 vote, and the Colorado State Senate approved it by a 22-13 vote.

State Sen. William Lindstedt (D-25), a sponsor of House Bill 26-1430, stated, "Initiative 175 is a special interest group's irresponsible solution to a legitimate problem." He added, "We remain committed to doing more to fix our roads and secure sustainable transportation funding, but not at the expense of hospitals and schools." Lindstedt also said, "It's time for the proponents of Initiative 175 to come to the table and work with us to chart a responsible path forward."

Eric Maruyama, spokesperson for Governor Jared Polis, stated, "Of course the governor would support a bill to cut taxes and save Coloradans money, and that includes cutting the gas tax while protecting the state budget."

Restore Our Roads, the organization leading the campaign in support of Initiative 175, stated, "Initiative 175 dedicates existing sales taxes generated from motor vehicles and motor vehicle parts and fuel taxes to fixing and maintaining Colorado's deteriorating roads." The group also said, "For years, transportation revenues have been raided for other priorities while Colorado's roads and bridges continue to deteriorate." Additionally, Restore Our Roads stated, "In the meantime, drivers are paying the price in costly vehicle repairs, longer commutes, and lost productivity." Following the signing of House Bill 26-1430, the organization stated, "The passage of HB 26-1430 unleashed an unprecedented power grab by the governor and Democratic-controlled legislature that strips voters of their right to decide how road dollars are spent with the stroke of a pen."

In 2018, Colorado voters defeated Proposition 110, which would have authorized $6 billion in bonds for transportation projects through an increase in the state sales and use tax. Unlike that measure, Initiative 175 seeks to reallocate existing revenues.