That very unofficial nine mile-per-hour “tolerance cushion” on Arizona’s interstate highway system is going away by the end of the month on certain freeway segments. Arizona Department of Transportation, Department of Public Safety and Governor’s Office of Highway Safety are designating 63 miles of Interstates 10 and 40, and U.S. 60 as safety corridors. These zero-tolerance corridors will see heavy traffic enforcement efforts in an attempt to reduce the number of accidents, motorist injuries and excessive deaths. The news from ADOT came Dec. 12, the day the first phase of enforcement went into effect for two segments on I-10. The corridors are marked with signs (1 comments)