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A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

Family members hug at the scene of a multi-vehicle accident on southbound I-75 in Detroit on Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to deadly accidents on a Detroit freeway Thursday, leaving at least two dead and about 20 injured on a mile-long stretch of roadway involving more than two dozen vehicles including tractor-trailers. (AP Photo/Detroit Free Press, Mandi Wright)

A multi-vehicle accident on south bound I-75 near Springwells, Mi., killed at least two people Thursday, Jan. 31, 2013 in Detroit. The crash involved at least two dozen vehicles including tractor-trailers. Michigan State Police Lt. Michael Shaw tells WWJ-AM that one person died in the Thursday morning crash on a mile-long stretch of Interstate 75 on the southwest side of the city. He says an undetermined number of people have been injured. White-out conditions were being blamed for the crash. (AP Photo/Detroit Free Press, Mandi Wright)

A firefighter helps a woman out of a car as emergency personnel responds to a multi-vehicle accident on Interstate 75 in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)

First responders and police officers shut down a freeway due to an accident involving multiple cars and semi-trucks in Detroit, Michigan January 31, 2013. Three people were killed and roughly two dozen injured in a series of crashes involving 30 to 40 vehicles in "white-out" conditions along a slippery stretch of highway in Detroit, state police said on Thursday. REUTERS/Rebecca Cook

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)

Authorities search a section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

Authorities search a section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)

Traffic is at a stand still as emergency personnel responds to a multi-vehicle accident on Interstate 75 in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

Traffic is at a stand still as emergency personnel responds to a multi-vehicle accident on Interstate 75 in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)

A firefighter holds a dog as emergency personnel responds to a multi-vehicle accident on Interstate 75 in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

A section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/Paul Sancya)

A firefighter holds a dog as its owner is removed from her car to be taken for medical treatment after a multi-vehicle accident on south bound I-75 in Detroit Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to deadly accidents on a Detroit freeway Thursday, leaving at least two dead and about 20 injured on a mile-long stretch of roadway involving more than two dozen vehicles including tractor-trailers. (AP Photo/Detroit Free Press, Mandi Wright)

Marc Milam of Rochester Hills, Mich. makes a phone call as authorities search a section of multi-vehicle accident on Interstate 75 is shown in Detroit, Thursday, Jan. 31, 2013. Snow squalls and slippery roads led to a series of accidents that left at least three people dead and 20 injured on a mile-long stretch of southbound I-75. More than two dozen vehicles, including tractor-trailers, were involved in the pileups. (AP Photo/The Detroit News, David Coates)