On Wednesday, Cody Olson was sentenced to 20 years in prison. He'll have to serve three years behind bars once he's eligible for parole. He pleaded guilty to two counts of vehicular manslaughter back in November.
ITD says it made the change to improve the flow of traffic and to make the drive safer.
The transportation department also says, their research showed that 85 percent of motorists are already driving at 60 miles per hour on that stretch of road.