In a Jan. 22, 2013 photo, the speedometer of a 1984 Monte Carlo is seen at the GM Heritage Center in Sterling Heights, Mich. For years, most speedometers topped out at 120, a speed that many cars could come close to reaching, even though it was 50 mph over the limit in most states. Then, in 1980, Joan Claybrook, who ran the National Highway Traffic Safety Administration, limited speedometers to 85 mph, even though cars could go much faster. (AP Photo/Carlos Osorio)

Associated Press
In a Jan. 22, 2013 photo, the speedometer of a 1984 Monte Carlo is seen at the GM Heritage Center in Sterling Heights, Mich. For years, most speedometers topped out at 120, a speed that many cars could come close to reaching, even though it was 50 mph over the limit in most states. Then, in 1980, Joan Claybrook, who ran the National Highway Traffic Safety Administration, limited speedometers to 85 mph, even though cars could go much faster. (AP Photo/Carlos Osorio)
In a Jan. 22, 2013 photo, the speedometer of a 1984 Monte Carlo is seen at the GM Heritage Center in Sterling Heights, Mich. For years, most speedometers topped out at 120, a speed that many cars could come close to reaching, even though it was 50 mph over the limit in most states. Then, in 1980, Joan Claybrook, who ran the National Highway Traffic Safety Administration, limited speedometers to 85 mph, even though cars could go much faster. (AP Photo/Carlos Osorio)
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