Preserve Infrastructure

Infrastructure Performance Measures
Historical Infrastructure Index

In 2019, the methods for this calculation were changed to indicate the condition of the assets instead of how well the asset condition targets were met.

Infrastructure Index

Infrastructure Performance Measures

Pavement Condition

These values represent the weighted average condition of high and low volume highways that are in good and fair condition, using the International Roughness Index (IRI), as the indicator.

Bridge Condition

These values represent the combined average Bridge Health Index (BHI) score, which is the health rating for bridge condition for bridges in the respective category.

Traffic Management System Condition

These devices and signals are key infrastructure measurements to manage traffic, and provide a safe, and reliable movement of goods, services and people. The department tracks the health of these through ongoing preventative maintenance and performance monitoring.


This measure shows the percentage of ITS field devices communicating with the Traffic Operations Center (including CCTV, VMS, Traffic Signals, Ramp Meters, Traffic Monitoring Sensors).

Signal Condition

These values represent the percent of UDOT traffic signals that are in good, average and poor condition.


Pavement Management

Under the philosophy, "good roads cost less," UDOT manages more than 16,000 lane miles of pavement throughout the state. We take a proactive approach to preserve and rehabilitate these vital assets to avoid costly reconstruction treatments. Pavement is prioritized in two categories based on the volume of daily vehicle usage and the volume of freight:

  • High volume system: Interstate (such as I-15 or I-80), most of our National Highway System and other roads experiencing over 1,000 vehicles a day. These roads carry 98 percent of traffic so our goal is to maintain the current condition levels with over 60 percent in good condition and less than 5 percent in poor condition. Pavement centerline miles are used to determine the percentages for Good, Fair, and Poor.
  • Low volume system: Includes roads primarily in the rural portions of our state with less than 1,000 vehicles a day. Our goal is to improve our current condition levels to previous levels with over 30 percent of mileage in good condition and less than 20 percent in poor condition. Pavement centerline miles are used to determine the percentages for Good, Fair, and Poor.

High Volume:
> 1000 AADT
Centerline miles - 3,925, 67%
Lane miles - 80%
VMT - 98%
Surface areas - 81%

Low Volume:
< 1000 AADT
Centerline miles - 1,955, 33%
Lane miles - 20%
VMT - 2%
Surface areas - 19%

Bridge Management

The condition of bridges in our inventory is the envy of the country. We strategically invest our funding to proactively preserve, rehabilitate and reconstruct our structures. UDOT uses the Bridge Health Index (BHI) which measures and tracks the overall structural condition of the three categories of bridges in our system.

National Highway System

National Highway System: Bridges along the Interstate Highway System and roads serving airports, rail or truck terminals, and other facilities.

State Owned Bridges

State Owned Bridges: These bridges are owned by the state and include pedestrian and rail bridges.

Locally Owned Bridges

Locally Owned Bridges: All bridges not owned by state and national system that carry traffic on public routes.

Signals & Intelligent Transportation Systems

Ongoing monitoring of our traffic signals and Intelligent Transportation Systems ensures consistent reliability and extends the life-cycle of these devices. This proactive approach determines if devices are in good working condition or when they need to be replaced, upgraded, or decommissioned.