Why is this project needed?
Northern Davis and Southern Weber counties are changing, and transitioning from rural/agricultural to more residential suburban and commercial uses. Continued and projected growth is leading to increased travel demand on Davis County’s north-south routes. Currently, U.S. 89 between I-15 and I-84 is experiencing heavy traffic congestion and increased delay times.
Traffic models predict that by 2040, if U.S. 89 is left in its current configuration, the traffic volume will increase by 43%, from 37,700 to 54,000 vehicles per day. In addition, a high number of crashes are occurring that are related to speed and lane changes associated with traffic congestion. The frequency of crashes involving wildlife along this corridor is also high.
The U.S. 89; Farmington to Interstate 84 project will improve U.S. Highway 89 by addressing current and future congestion, the high crash rating and additional growth in this part of the Wasatch Front. This project reflects UDOT’s commitment to keep traffic moving now and in the future.
How much traffic is anticipated in the future for the US-89 corridor?
The information below shows current and future traffic volumes. Regional growth projections assume a 35% increase in traffic by 2040. Currently, through traffic makes up 73% of all vehicles on U.S. 89, while only 27% are local trips.
Cross Road with Annual Average Daily Traffic (AADT) – US-89
2015 Traffic (Actuals)
|2017 Traffic (Actuals)||2040 Traffic (Projected)|
|200 S Fruit Heights||32,745||37,391||45,843|
|200 N Kaysville||33,440||38,182||46,816|
|Mutton Hollow Rd||33,225||38,347||46,515|
|Oak Hills Dr||33,445||38,179||46,823|
|SR-193 Hill Field Rd||45,729||48,944||63,861|
|SR-60 – South Weber Dr.||49,785||56,845||69,699|
73% of traffic is through traffic.
How will the project improve traffic flow?
Currently, U.S. 89 operates using a series of traffic signals at many of the intersections. The signals are intended to maintain some access between local streets and U.S. 89 or provide access across the highway. Due to increasing traffic volumes, these intersections have become the cause of significant traffic congestion in recent years. This congestion also exists for cross traffic moving east-west.
The U.S. 89 State Environmental Study (SES) identified several locations where grade-separated interchanges or crossings could be added to improve traffic and allow vehicles to move more freely and at consistent speeds. These grade-separated connections or crossings will also improve cross-access and between side streets and U.S. 89. In addition, eliminating traffic signals improves safety by reducing the risk of accidents.
What is grade-separation?
A grade-separated interchange is a bridge with connecting ramps for access to and from U.S. 89.
Which roads will be interchanges and which will only be overpasses?
The U.S. 89 SES identified the need for grade-separated interchanges at 200/400 North, Oak Hills Drive, Gordon Avenue, and Antelope Drive. Overpasses are being proposed at Nicholls Road and Crestwood Drive. The project design team is investigating options to reduce project impacts and incorporate public input. UDOT is committed to building this project the right way, by working in concert with cities and stakeholder to balance the needs of the traveling public and the surrounding community. More information will be provided as project design progresses through 2019.
How will the project improve safety on the corridor?
Crash rate data shows that replacing intersections with grade-separated interchanges reduces the frequency and severity of accidents. Recent statistics show that the crash rate on a road like U.S. 89 with traffic signals is 4.5 times higher than with interchanges. The rate of severe crashes is also 3.5 times higher. By removing signalized intersections and replacing them with grade-separated interchanges, the number of possible vehicle conflicts decreases substantially, resulting in fewer accidents. The project also plans to install wildlife fencing to reduce the number of wildlife related crashes.
When would construction begin?
The project team is currently working on design refinements and evaluating construction schedules. A construction date has not been determined at this time. More information will be provided via project updates as schedules are confirmed.