Impact of Inflation on Road Funding / Illinois DOT
The Illinois DOT used a graph showing the number of miles of state-maintained roads in need of unfunded rehabilitation or reconstruction, which was referred to as the backlog. The graph, shown in the figure below, illustrates the fact that the backlog was growing over time due to the inadequacy of funding. The increasing trend in backlog prompted the Illinois DOT to reconsider its approach to selecting projects and treatments, moving towards the increased use of preservation treatments to slow the rate at which pavement conditions drop into a backlog condition. In addition to the change in treatments, the Illinois DOT developed a new pavement performance measure based on the percent of the network in good enough condition to be a candidate for a preservation treatment. The change in performance measure was intended to shift funding priorities from deteriorated pavements to those that could be kept in good condition for a longer period of time. The changes were documented in the Illinois DOT’s April 2018 Transportation Asset Management Plan (http://www.idot.illinois.gov/transportation-system/ transportation-management/planning/tamp) and were used in developing the fiscal year 2019-2024 Multi-Year Proposed Highway Improvement Program. In addition, new software tools are being acquired to further support this improved approach to managing pavements and bridge assets.
Source: Illinois DOT Transportation Asset Management Plan. 2018.
Read more in the chapter: 6.3.2 Using Trend Data to Make Program Adjustments