There's been a lot of talk on how to replenish the New Jersey Transportation Trust Fund.

Experts project that the depleted fund, which finances construction and maintenance on highways and bridges, will run out of money for new projects in 2015.

That's why state Assemblyman John Wisniewski (D-Middlesex) proposed a bill that would raise the gas tax by at least 25 cents a gallon, bringing in an addition $1.25 billion a year in revenue.

State Sen. Raymond Lesniak (D-Union) has also put forward a bill that would raise the gas tax by 15 cents a gallon over a three-year period.

The proposed bills have been controversial. A Rutgers poll showed a majority of New Jersey residents oppose the gas tax hike.

But how does the current gas tax work? And if any of these bills pass, where is the money you pay at the gas pump going to go? How is it gonna contribute to the trust fund?

Below is an interactive graphic, explaining how it's all going to work:

NEW JERSEY GAS TAX EXPLAINED

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below.