Crowds gather to watch the Fourth of July fireworks show last year at Kailua Beach on the Hawaiian island of Oahu. Julie Thurston Photography via Getty Images hide caption

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Fueled by low gas prices and a stronger economy, Americans drove a record 3.15 trillion vehicle miles in 2015. But the additional driving may lead to more pollution and traffic gridlock. Zoran Milich/Getty Images hide caption

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Cheap Gas Means More Driving And Getting Stuck In Traffic

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Consumers have been benefiting from lower gas prices. Here, prices dip below $2 per gallon at an Exxon station in Woodbridge, Va., on Jan. 5. Saul Loeb/AFP/Getty Images hide caption

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Why Cheap Gas Might Not Be Good For The U.S. Economy

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A customer fills up at a gas station in Chillicothe, Ill., in December. Low prices have meant big savings for consumers, but urban planners worry that cheap gas will encourage sprawl. Bloomberg/Bloomberg via Getty Images hide caption

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$1.22 A Gallon: Cheap Gas Raises Fears Of Urban Sprawl

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A woman fills her car with gas in Woodbridge, Va., on Tuesday. Supplies of crude oil and refined gasoline have driven prices at the pump down, and they're expected to go even lower. Saul Loeb/AFP/Getty Images hide caption

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Prices, as seen at a gas station in Woodbridge, Va., on Tuesday, are 21 cents a gallon cheaper than this time last year. The drop violates the historic rule that tension such as that currently between key producers Saudi Arabia and Iran causes the cost of a barrel of oil to rise. Saul Loeb/AFP/Getty Images hide caption

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Gas prices are displayed at a service station in Leonia, N.J., Nov. 24. Gas is under $2 a gallon across much of the country and the price is expected to remain low next year. Seth Wenig/AP hide caption

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Low Gas Prices Expected To Continue In 2016

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Students at the Pennsylvania College of Technology are learning a technique called "tripping pipe," moving a pipe from a stack into a horizontal position and lowering it down into a well. The students train on a practice drilling rig to learn how to be roustabouts. Jeff Brady/NPR hide caption

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In Pennsylvania, Employment Booms Amid Oil And Natural Gas Bust

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Cushing, Okla., is a major oil storage site. Amid record oil production, some analysts worry the U.S. will run out of places to put it all. Daniel Acker/Bloomberg via Getty Images hide caption

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With So Much Oil Flowing, U.S. May Be Reaching Storage Limits

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The James C. Nance Memorial Bridge, which connects Purcell and Lexington, Okla., is closed for repair in March 2014. A handful of states have raised their gas taxes in part to fund transportation projects like bridge and road repairs. Sue Ogrocki/AP hide caption

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Failing Bridges Taking A Toll; Some States Move To Raise Gas Tax

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