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

itoggle caption Jeff Brady/NPR

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

itoggle caption Daniel Acker/Bloomberg via Getty Images

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

itoggle caption Sue Ogrocki/AP

Traffic moves along Route 21 in downtown Newark, N.J., where a gas station lists the price for regular unleaded gasoline at $1.72. Julio Cortez/AP hide caption

itoggle caption Julio Cortez/AP

The price of jet fuel has dropped, but airlines are still adding fuel surcharges to the price of many tickets. Many other industries that use large amounts of fuel, like shipping and delivery services, have also maintained extra fuel fees. Nam Y. Huh/AP hide caption

itoggle caption Nam Y. Huh/AP

Jed Brown drives 100 miles each day to work between Pennsylvania and West Virginia. Cheaper gas is making his commute more manageable, but he doesn't expect the low prices to last. Uri Berliner/NPR hide caption

itoggle caption Uri Berliner/NPR

Larry Coleman, a salesman with Trudeau's Marine, talks to Bill Floren and Kimberly Abramski at the 55th Annual Portland Boat Show on Jan. 7 in Oregon. Lower fuel costs are projected to boost boat sales this year. Kristyna Wentz-Graff/The Oregonian/Landov hide caption

itoggle caption Kristyna Wentz-Graff/The Oregonian/Landov

Dodge Ram pickup trucks await customers Jan. 5 on the lot at Landmark Dodge Chrysler Jeep in Morrow, Ga. Buoyed by a resurgent economy, holiday sales, cheap gasoline and a love affair with pickup trucks, Americans headed to car dealers in droves last month, pushing full-year sales to what's likely to be the highest level since 2006. John Bazemore/AP hide caption

itoggle caption John Bazemore/AP

U.S. gasoline prices have fallen sharply since last summer, driven by surging oil production and other factors. The price for a barrel of U.S. West Texas Intermediate crude fell below $50 Monday. David N. Goodman/AP hide caption

itoggle caption David N. Goodman/AP

The lowest gas prices in years are seen Wednesday on a fuel sign in Lawrence, Kan. A day later, OPEC decided to maintain current production levels, virtually ensuring continued low prices at the pump. Orlin Wagner/AP hide caption

itoggle caption Orlin Wagner/AP

Pumpjacks at the Inglewood oil fields in California in March. Some of the most controversial methods of oil extraction, like fracking, oil sands production and Arctic drilling, are also expensive. That's made them less profitable as the price of oil continues to fall. Richard Vogel/AP hide caption

itoggle caption Richard Vogel/AP