BRIGHAM CITY — The Utah Department of Transportation (UDOT) informed the Utah Transportation Commission of its decision to raise the speed limits on certain areas of rural Utah interstates today during the monthly Utah Transportation Commission Meeting, held in Brigham City Council chambers.
Traffic and Safety Director Robert Miles told the commission that the division has completed an analysis on speed, crash and fatal crash data. The studies were conducted this spring, and determined that raising the speed limits in these areas would be safe and appropriate.
UDOT will increase the speed limit on stretches of Interstate 80 from 75 miles per hour to 80 mph from the I-84 Junction to the Wyoming border (MP 167.45 to 196.68).
A map of proposed changes for Interstate 80 speed limits
Interstate 70 also has four sections of highway that will increase from 75 mph to 80 mph:
- The I-15/I-70 Junction to just past Cove Fort (MP 5),
- Just west of the US-89 Junction to Exit 63- Gooseberry Rd. (MP 21-63)
- Exit 73 – Ranch Exit to Exit 138 – Brake Test Area (MP 73.9-138.7)
- Exit 146 – Reef View Area to the Colorado border (MP 146-231).
A map of proposed speed limit changes for Interstate 70.
On Interstate 84, three stretches of road will increase from 65-70 mph to 70 or 75 MPH:
- I-15 to the mouth of the Canyon (MP 81-88) 70 mph
- Between Ogden and Morgan (MP 92-106) 75 mph
- Near Henifer to the I-80/84 Junction 75 mph
A map of proposed speed limit changes on Interstate 84.
SALT LAKE CITY — Utah Department of Transportation crews canvassed the urban interstate across the Wasatch Front, replacing speed limit signs while officially changing the speed limit from 65 to 70 mph.
A new 70 mph speed limit sign waits to be installed.
In an effort to optimize mobility and Keep Utah Moving, crews from UDOT Regions One, Two and Three spent all day on December 8th, changing out 99 signs from Spanish Fork to Ogden. In many instances, the crews simply placed a decal on the existing sign, but several of the older signs were replaced outright.
The speed limit increased on Interstates 15, 80 and 215. However, two sections of I-80 will remain at 65 mph, as engineering studies show the terrain doesn’t allow for a speed increase.
The choice to implement the new speed limits was based on several studies, and in response to last year’s legislation (H.B. 80).
Utah is not the first state to raise speed limits to 70 mph or faster. Nearly one-third of the United States has speed limits set at 70 mph or faster in urban areas, and more than two-thirds of states have increased them in rural areas.
UDOT workers change out speed limit signs on I-80 westbound
Existing 80 mph zone on northbound I-15 near Paragonah. Photo taken by Ming Jiang of the Traffic and Safety Division.
A number of bills passed by the legislature this past session affect Utah roads and highways. One of these bills was HB 83: Speed Limit Amendments. This bill expands portions of I-15, I-80, and I-84 where the Utah Department of Transportation may establish a posted speed limit that exceeds 75 miles per hour. These sections of freeway include, portions of I-15 from Santaquin to St. George and from Brigham City to the Utah-Idaho border. Portions of I-80 potentially affected will be from Grantsville to the Utah-Nevada border and I-84 from Tremonton to the Utah-Idaho border.
If the Department of Transportation chooses to increase the speed limit in these sections the department will evaluate the results and impacts of increasing the speed limit and will report the findings of the evaluation to the Transportation Interim Committee no later than one year after the speed limit is posted.
This bill continues a process which began a number of years ago to evaluate some of Utah’s interstates to determine if there are areas that could appropriately accommodate speed limits above what is currently posted.
Opponents of this bill feared that with an 80 mile per hour speed limit there would be an increase in accidents and that drivers would increase their speed beyond 90 miles an hour. Through the studies conducted over the past few years the department has found that this is not the case.
Beginning in 2008, studies were conducted on portions of I-15, where the speed limit was increased from 75 to 80 mph. The studies concluded that most drivers preferred to drive between 82 and 83 mph regardless of the posted speed limit. Accident rates on these stretches of freeway were also studied and concluded that the increased speed did not affect the number of accidents or fatalities.