TRENTON - Assembly Speaker Vincent Prieto has introduced a measure that asks voters to approve constitutionally dedicating revenue from the state's gas taxes to transportation projects.

Prieto announced the constitutional amendment on Friday.

The measure comes as the Democrat-controlled Legislature and Republican presidential candidate Chris Christie wrangle over how to shore up the state's transportation trust fund. Democrats say they back raising the state's gas tax, but Christie has said Republicans should oppose such a hike unless other taxes are also cut.

Prieto's measure does not propose raising taxes, but if approved it would mean revenues must go toward the transportation trust fund.

Prieto says that in fiscal year 2016, the state's fuel taxes will generate $541 million.