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 the sum of additional travel time on major routes(Interstates, highways and arterials) in the state each month. Delay is measured as the difference between the actual travel time and free-flow travel time.

Target: Delay should not grow by more than 4% annually


Reliability is the percent of miles on major routes that were uncongested and performed consistently with historical speeds during the peak hour.

Target: 90% of the system will be reliable.

Mode split

The stacked bar chart on Mode Split below shows average daily trips by people in vehicles and on UTA transit in the I-15 Corridor in Salt Lake County. The Mode Split performance measure score is determined by dividing the actual percentage of transit trips by the target percentage transit trips and multiplying by 100.

Target: 10 percent of all trips in the corridor are transit trips.

Snow and Ice Removal Efficiency

The percentages shown represent current winter efforts success in our ability to maintain roadways free of snow and ice.

Target: (B+) 87% or greater for the acceptable and exceptional categories.