Unsafe at Any Speed is a 1965 non-fiction book by consumer advocate Ralph Nader criticizing American automobile manufacturers for resisting safety improvements like seat belts and designing vehicles with inherent hazards. The book, particularly its chapter on the Chevrolet Corvair's suspension defects, became a bestseller and led to the creation of the U.S. Department of Transportation in 1966 and the National Highway Traffic Safety Administration in 1970.