Migrants ride on top of a northern bound train toward the US-Mexico border in Juchitan, southern Mexico, on April 29. Migrants crossing Mexico to get to the U.S. have increasingly become targets of criminal gangs who kidnap them to obtain ransom money.

Migrants riding on top of a northern bound train toward the US-Mexico border reach out to catch food tossed to them by residents, in Union Hidalgo, southern Mexico, on April 29.

Residents toss food to migrants riding on top of a northern bound train toward the US-Mexico border in Union Hidalgo in Oaxaca, southern Mexico, on April 29.

Migrants ride on top of a northern bound train toward the US-Mexico border in Union Hidalgo, southern Mexico, on April 29.

A car is jammed between two trucks after a mile-long pile-up on Interstate 75 in Detroit on Jan. 31.

Vehicles are at a standstill after a multi-vehicle accident in Detroit on Jan. 31.

The front of a car is under a truck after a multi-vehicle accident on Interstate 75 in Detroit on Jan. 31.

Debris sits on the road after multi-vehicle accident on Interstate 75 in Detroit on Jan. 31.

Anchored container ships sit offshore near the ports of Los Angeles and Long Beach during a strike by the International Longshore and Warehouse Union Local 63 Office Clerical Unit in Los Angeles, Calif., Dec. 2, 2012. The strike by clerical workers at the twin ports idled most of the busiest U.S. cargo shipping complex for a sixth day on Sunday as container-laden vessels waited to be unloaded and marathon contract talks stretched into the night.

A road normally crowded with trucks is seen empty during the strike at the Port of Los Angeles on Sunday.

People wait for gas at a Hess fuelling station in Brooklyn, N.Y., on Nov. 2.

A police officer moves a car that is out of gas, trying to position it so it can fill up, at a gas station in Brooklyn, N.Y. on Nov. 2.

A policeman stands guard between a line of New York City yellow taxi cabs waiting to get fuel from a gas station in Midtown Manhattan on Nov. 2.

A woman covers her face in frustration while waiting for hours in line to get fuel outside at a gas station in Queens, N.Y., on Nov. 1, 2012.

A man fights for his place in line while waiting to get fuel at a gas station in Queens, N.Y., on Nov. 1, 2012.

A truck driver covers his face to protect himself from dust as he waits to unload his cargo of cereal grain at the rail terminal in Alto de Araguaia, Brazil, on Sept. 24.

Truck driver Geraldo drives along the dangerous highway BR-163, also known as the as the "Highway of Death," in Lucas do Rio Verde, Brazil, on Sept. 28, 2012.

Truck driver Ediban Tardoni sits on a chair with his son Thablio Tardoni, 6, as he waits to unload his truckload of cereal grain at a rail terminal in Alto de Araguaia, Brazil, on Sept. 24, 2012.

A truck driver drives passes shipping containers and an image of Christ the Redeemer after he unloaded his freight of cereal grain at Brazil's main ocean port of Santos, on Sept. 20, 2012.

A cap hangs from a cross alongside highway BR-163, also known as the "Highway of Death" in Lucas do Rio Verde, Brazil, on Sept. 28, 2012. More than 1,200 truckers died on Brazil's federal highways last year, according to police data. To dissuade drug use and reduce the death toll, the government recently mandated rest periods for truckers for the first time.

Truck driver Paulo dos Santos, 43, his wife Roseli Nesteraqui, 39, and their children Wellinngton, 18, and Erica, 12, wait for a second day for a new axle to arrive for their truck at a petrol station near highway MS-306 in Chapada do Sul, Brazil, on Sept. 18, 2012.

A truck driver sleeps in a hammock during a break at a truck stop along highway MS-306 in Chapada do Sul, Brazil, on Sept. 18, 2012. To reduce the death toll on Brazil's highways, the government recently mandated rest periods for truckers for the first time. Employed truckers who drive most of the truck miles covered in Brazil are now restricted to eight hours at the wheel per day, but self-employed truck owners can press on for 13.

A petrol station worker cleans the window of a truck next to an image of "Our Lady of the Road," near highway BR-163, also known as the "Highway of Death," in Nova Mutum, Brazil, on Sept. 27, 2012.

A passenger jet comes into land over houses next to Heathrow airport on August 28, in London, England. Transport Secretary Justine Greening has stated that the Government remains opposed to the building of a third runway at London's Heathrow airport despite calls from some Conservative Members of Parliament for the coalition to reconsider.

Passengers wait to be rescued on the overturned capsized MV Skagit/Kalama off the coast of Zanzibar, Tanzania, on July 18. MV Skagit/Kalama carrying 250 adults and 31 children onboard capsized off the east African coast of the Zanzibar in Tanzania, killing at least 15 people. One foreign woman was among the dead, the reports say. The boat was heading to Zanzibar from Tanzania's capital Dar es Salaam.

Rescuers assist a survivor from a ferry tragedy, at the port of Zanzibar on July 18. Rescue boats and divers were searching for any remaining survivors on the mostly submerged vessel.

An AN-30 military aircraft lies off the runway at the Czech air force base in Caslav, some 20 miles east of Prague, Wednesday, May 23. An official says the Russian military plane caught fire after problems during the landing maneuver, injuring at least six people on board. Czech military spokeswoman Jana Ruzickova said the plane had 23 people on board, 14 Russians and 9 Czechs. Five Russians and one Czech national have suffered injuries, mostly burns. The plane and Russian officials were in the Czech Republic on a regular monitoring mission.

Firefighters evacuate debris from a Russian military Antonov An-30 aircraft lying on May 23, in a field near the airbase in Caslav, about 80 kms (50 miles) east of Prague, after skidding off the runway as it was landing. Seven people were injured, including two who were taken to a hospital in Prague by helicopters with serious burns after the plane caught fire.

Melanie Schultz van Haegen-Maas Geesteranus, Dutch Minister of Infrastructure and Enviroment, drives Wubbo Ockels Superbus in Valkenburg, The Netherlands on 15 May 2012 after the RWD, the institution that provides the registration of motor vehicles, provided the registration for the bus. The Superbus project aims to develop high speed coaches capable of speeds of up to 250 kilometres per hour (160 mph) together with the supporting infrastructure including special highway lanes constructed separately next to the nation's highways.

Melanie Schultz van Haegen-Maas Geesteranus (L), Dutch Minister of Infrastructure and Enviroment and Dutch physicist Wubbo Ockels (R) sit inside Ockels' Superbus in Valkenburg.

Melanie Schultz van Haegen-Maas Geesteranus, Dutch Minister of Infrastructure and Enviroment places a license plate on Wubbo Ockels' Superbus in Valkenburg.