The speed limit has been increased to 80 mph in several areas of the state. Those areas are:
• I-80, from the Nevada border to SR-36
• I-15 between North Leeds and Santaquin (with sections of 75 mph zones through two mountain passes and Cedar City)
• I-15 and I-84 from the Brigham City North Interchange to the Idaho border
The speed limit increase is the result of House Bill 83, passed during the 2013 legislative session, which allowed the department to study and establish speed limits higher than 75 on the interstate.
UDOT’s data from speed studies of existing 80 mph zones showed that vehicle crashes have slightly dropped over the past three years, attributed to more vehicles traveling at the same speeds and less variation in the speed of surrounding vehicles.