Optimize Mobility

UDOT optimizes mobility of Utah by minimizing delay, continually increasing the reliability of travel times, offering a range of modes of travel, and clearing roadways of snow and ice during winter months.

Mobility Performance Measures

  • Delay
  • Reliability
  • Mode Split
  • Snow


The additional travel time experienced by a driver, passenger or pedestrian due to circumstances that impede the desirable movement of traffic. It is measured as the time difference between actual travel time and free-flow travel time. 

I-15 Delay Index

1-15 Payson to Brigham City & So. Utah  (5 to 6 pm)


The Buffer Time Index (BTI) represents the additional time drivers need to add to their average travel time to ensure that they arrive at their destination on time 95% of the time.

I-15 Reliability Score 

1-15 Payson to Brigham City & So. Utah  (5 to 6 pm)

Mode Split

Coming Soon!

Snow and Ice Performance

Average Statewide Performance (% of acceptable/exceptional road conditions during winter storms)