Optimize Mobility

Mobility Performance Measures
Historical Mobility Index
Mobility Index


Strategic Capacity Improvements

Through a data driven prioritization process, capacity projects are selected that add new lanes or roads to the state’s roadway system. Each project is evaluated by the volume of traffic, amount of congestion, and safety. Improvements can include widening existing facilities, new interchanges on existing freeways, or additional passing lanes. Click here to view an interactive map of these projects and more information on our prioritization process.

Efficient Operations

With Utah’s population expected to double by 2040, it is important that UDOT help the traveling public make more informed decisions and work with community partners and agencies to improve access to travel choices. We seek solutions that fit community, environmental and economic needs to improve mobility through a reducing congestion on our roadways and extending the life of our assets.

Public Information

UDOT employs several tactics to inform the public of roadway construction, incidents, and other important safety information. We use variable message signs (VMS) informing drivers of expected travel times, weather conditions, and safety messages to remind travelers of our goal to reach Zero Fatalities on our roadways.

For updates and stories of how UDOT is keeping Utah moving, connect with us on social media Facebook, Twitter, Instagram, or YouTube for updates and stories. Travelers can also get up-to-date roadway information by downloading the UDOT Traffic app featuring a statewide map of current traffic conditions, traffic camera images, and road weather forecasts.

Traffic Signals

Signal Optimization

Utah is leader in the nation when it comes to signal optimization. More than 95 percent of signals in the entire state are connected to one shared system managed at UDOT’s Traffic Operations Center (TOC).This enables our engineers to develop adaptive signals to adjust cycle length times to accommodate motorist and pedestrian traffic. We are also able to reduce stops, delays, gasoline consumption and air pollution by up to 25 percent by synchronizing traffic lights.

Snow Removal

Here in Utah, we’re known for the greatest snow on earth. When winter storms occur, the public, businesses, and the economy are dependent on clear roads to safely travel to their destinations. We operate a fleet of more than 500 snow plows to remove more than 65 million tons of snow and ice on Utah’s roads every year.

UDOT also harnesses Road Weather Information Systems (RWIS), a technology that allows us assess conditions such as road temperature, wind speed, and visibility. This improves our ability to inform the public of potentially hazardous roadways conditions and strategically deploy snow plows and apply salt brines to roads.

Enable Travel Choices

Offering alternative modes of transportation will improve mobility on roadways and extend the life of our assets. By working with our community partners, we encourage and facilitate the development of an integrated transportation system that fit community, environmental, economic and transportation conditions.

The TravelWise program encourages residents to rethink the way they travel to reduce congestion on roadways. Actions such as shifting travel times to avoid primary commute periods, taking transit, or combining errands also known as trip chaining.

Enable Travel Choices Image


Mobility Performance Measures


Delay is defined as the additional travel time experienced by a driver, passenger or pedestrian, due to circumstances that impede the desirable movement of traffic such as bottlenecks, car accidents or weather conditions. It is measured as the time difference between congested travel time, the travel time at 50 mph, which is the optimal speed to maximize traffic flow.

  • Monthly delay: Delay is calculated for all vehicles in both directions of major roads in the state for all hours everyday.


The reliability graph below is determined by comparing the average speed of vehicles (50 mph) and extra time required for travelers to ensure on-time arrival 95% of the time, also known as Buffer Time Index (BTI).

  • Reliability score: The Reliability Score is determined by the percentage of reliably fast 1-mile segments. Reliably slow and unreliable segments get a score of 0. The freeway segment values are weighted by their Vehicle Miles Traveled (VMT).
  • Normalized reliability score: The normalized reliability score is determined by dividing the reliability score by the target of 85%. This results in a maximum normalized reliability score is 100 which can then be used to support the overall composite metric. Composite metric of 100 can be used to support the overall composite metric. See graph in dashboard below.

Mode split

The graph on Mode Split below shows person trips from current volumes and UTA ridership as percentage of goal in Salt Lake County I-15 corridor during PM peak period. The normalized mode split score on the graph is determined by the dividing the percentage of transit ridership by the target of 10 percent. The maximum normalized mode split value is 100.

Snow and Ice Removal Efficiency

The pie chart on Snow and Ice Removal Efficiency shows how effectively UDOT was able to remove snow and ice from roadways around the state in 2017. Additional information on current road conditions can be found on the UDOT Traffic Website.

Snow and Ice Removal Month to Month

The bar on Snow and Ice Removal on a month to month basis compares snow and ice removal since November 2015. The graph compares Snow Removal over two winters.