
A Dallas Police officer walks past the Dallas Police Dept. motorcycle after one of their officers was killed in an accident while escorting Hillary Clinton's motorcade on February 22, 2007, in Dallas, Texas. The accident occurred on the Houston St. viaduct over the Trinity River. The officer later died from his injuries.
(Irwin Thompson/Dallas Morning News/MCT)

An Iraqi police graduate rides a motorcycle over his colleagues as they show their skills during a graduation ceremony in Baghdad, Iraq, Monday, Feb. 11, 2008. Some 900 policemen graduated after a six week training.
(AP Photo/Loay Hameed)

George "Motorcycle George" Barrett, 70, takes one last ride Monday, Oct. 30, 2006, in a special Harley-Davidson hearse down Rt. 24, in Bartonville, Ill. Gary Simpko of Midwest Iron Horse Funeral Coach Service hauls Barrett's casket to burial services at Lancaster Cemetery outside Glasford. Friends and family told stories of George's exploits and remembered him with a T-shirt bearing a picture of George standing by his favorite bike. Barrett died Oct. 26th from advanced lung cancer.
(AP Photo/Journal Star, Fred Zwicky)