This proposed law would eliminate the requirement that the state's gasoline tax, which was 24 cents per gallon as of September 2013, (1) be adjusted every year by the percentage change in the Consumer Price Index over the preceding year, but (2) not be adjusted below 21.5 cents per gallon.
Source for Popular Vote data: Massachusetts Secretary of the Commonwealth. Question 1, Massachusetts Secretary of the Commonwealth (http://electionstats.state.ma.us/ballot_questions/view/2465/) (accessed 26 Dec 2014)