Arizona voters will decide Nov. 3 whether to prohibit taxes and fees based on the distance a vehicle travels.

Proposition 141 would amend the state constitution and restrict how governments monitor drivers’ mileage. State lawmakers placed it on the ballot through a legislative referral. A no vote would leave the current constitutional language on taxation in place, according to the Arizona Legislature.

The measure comes as revenue from Arizona’s 18-cent gas tax declines. That money funds road improvements, but more fuel-efficient cars and electric vehicles have reduced gasoline sales. Department of Energy figures put the number of electric vehicles in Arizona at 4,700 in 2016 and nearly 142,000 in 2025.

Republican state lawmakers supported putting the proposal on the ballot, while most Democrats opposed it. Supporters argue that a mileage-tax ban would protect privacy, businesses and the economy.