Heavy traffic, construction projects expected this weekend on I-15 and I-84
SALT LAKE CITY – The Utah Department of Transportation (UDOT) advises travelers driving to the Royal Purple Las Vegas Bowl or the Famous Idaho Potato Bowl this weekend to allow extra time due to heavy traffic and road construction in Arizona, Nevada and Idaho.
Las Vegas Bowl
Drivers traveling south on I-15 to Las Vegas should be aware of expected delays from 30 minutes to an hour on Friday evening, Dec. 18, and Saturday morning, Dec. 19, in the Virgin River Gorge between St. George and Mesquite, Nev. Drivers returning from the bowl game should plan for similar delays on Saturday night, and up to two-hour delays on Sunday morning, as I-15 is reduced to one lane in each direction for bridge construction in the Virgin River Gorge.
In addition, construction delays are expected along a 30-mile stretch of northbound I-15 between Las Vegas and Mesquite. The freeway is reduced to one northbound lane in various locations throughout this construction zone.
Famous Idaho Potato Bowl Fans planning travel on I-15 and I-84 to Boise should also plan ahead for construction in southern Idaho. I-84 is reduced to one lane in each direction for approximately 11 miles between the I-86 junction and Burley. Crews are replacing two bridges over the Snake River.
More information about these projects is available online at the following websites:
For information on UDOT projects, visit udottraffic.utah.gov or download the UDOT Traffic app, available for iOS or Android devices. For real-time traffic and road information outside of the state, there are several smart phone applications available for download, including the Waze navigation app.
State projects win in “Quality of Life”, “Under Budget” categories
BOISE, Idaho — Dedication and understanding of the impact state-controlled roads have on motorists in Utah was recognized today, as UDOT projects in Southern Utah and Northern Utah garnered two regional awards in the 2015 America’s Transportation Awards competition.
UDOT’s Bluff Street at Southern Hills Parkway Interchangewas recognized in the Quality of Life/Community Development category, which recognizes “a transportation project that has contributed to the general quality of life and economic development of local communities. These innovative projects better connect people to businesses, jobs, health care facilities, and recreational activities while encouraging a mix of transportation modes. ” With comfortable weather and access to many outdoor activities and destinations, the largest city in Region Four provides so much of what St. George and Washington County residents who value quality of life are looking for.
So many new residents have come to the area seeking this quality of life that existing transportation infrastructure has been over-taxed. Nearly 43,000 cars travel along Bluff Street (SR-18) each day, and another 13,700 go through Red Hills Parkway. The clash of rural vs. urban can best be seen here, where a state highway suddenly becomes a city road where many cyclists and runners converge to get to and around the natural preserve. It’s the meeting point four multi-use trail systems, and is included in the course of many major sporting events in the area. All of this activity in a traditionally constructed intersection places residents and visitors at risk.
This was how the intersection looked before the project
In order to accommodate the current population as well as the expected growth through 2030, UDOT, the City of St. George and the Southern Utah Bike Alliance (SUBA) collaborated to reconfigure the intersection by creating a center exit interchange.
The center exit interchange creates a safer section of road, while also maintaining a steady flow of traffic. Highway travelers can continue on their way on the outside lanes, while those needing local access take the inside lanes to an intersection that allows east-west travel.
The construction team saved $4 million in construction costs by utilizing the natural topography of the area and building the project within natural grades.
The project after it was finished. Note the center offramp and bike trails
The project also integrated bike/pedestrian paths into the design, with box culverts under SR-18 allowing for safer multimodal transportation under busy roadways, thus connecting the community in a safe, efficient and positive way.
“UDOT should be commended for their positive design process that encourages outside voices and ideas,” said Craig Shanklin, SUBA President. “This was a great example of how the community can be involved in the design process and lead to a better outcome for all users.”
The Diverging Diamond Interchange at Brigham City’s US-91/1100 South location was honored in the “Under Budget” category. That category honors “a project demonstrating transportation efficiency while promoting economic and fiscal responsibility. The award recognizes a successful project brought in under budget that provided the greatest cost savings to the state(s) while offering maximum performance.”
How do you move a steadily increasing traffic flow through an aging, small interchange at the connection of US-91 and Interstate 15, near the northern Utah city of Brigham City? With more than 20,000 vehicles a day — many of them trucks — originating throughout the region, this old, inefficient interchange was reducing the economic lifeblood of local communities to a trickle.
The new DDI at Brigham City on the day it opened.
The 40-year-old interchange would frequently clog when vehicles at its ramps tried to enter the traffic flow. The predominant west to south-bound traffic on US-91 was so steady during the day that it was nearly hopeless for other movements to occur. This prompted risk-taking by trapped motorists at the ramps – and frequent crashes when they did. Regional special events, like local university football games, would bring traffic to a complete halt.
UDOT traffic planners needed a solution, but the answer was elusive. Soils adjacent to the Great Salt Lake were saturated by surface groundwater, making the interchange increasingly unstable. Engineers wondered how to upgrade it without a massive redesign to accommodate the increasing pounding from trucks. Similar rebuilds had cost upwards of $100 million – prohibitive under state budgets at the time.
The answer: innovate. Engineers used an innovation to solve the water issue — geofoam — which allowed the new interchange to “float” on soggy soils. Another innovation — advanced bridge construction — replaced the interchange’s old bridge over I-15 while adding a completely new span in a little more than 10 months. Finally, the innovative diverging diamond traffic pattern was added to the design to solve the problem of congestion and safety.
The white blocks are geofoam, which was used to construct the DDI in a environmentally- and structurally- sound way
The result? An efficient interchange that allows all traffic movements to occur safely and congestion-free, and all for less than $14 million.
“What UDOT and the project team eventually chose to do was not only innovative, but a brilliant solution to an extremely difficult situation with many built-in constrictions,” said Bradley Humpherys, a Senior Transportation Project Manager for Stanley Consultants.
Utah’s two projects — along with projects in California, Colorado, Montana, New Mexico, North Dakota, and Texas — will compete against projects from other regions in the U.S. for a National Grand Prize, the People’s Choice Award and $10,000 prizes to be given by the winners to a transportation-related charity or scholarship program.
The top two national winners will be announced in September at the AASHTO Annual Meeting in Chicago.
“These projects are a small sampling of the many ways in which state DOTs are improving peoples’ quality of life and providing for a vibrant economy,” said John Cox, American Association of State Highway and Transportation Officials President and Director of the Wyoming Department of Transportation.
The America’s Transportation Awards – co-sponsored by AASHTO, AAA and the US Chamber of Commerce – annually recognizes the best of America’s transportation projects in four regional competitions. Learn more about the projects and the competition at: AmericasTransportationAwards.org