News Release & Documents
STI Overview Map
Project Map

STI Overview Map

Criteria and Data

Each mode has developed documentation detailing score results under STI, which are contained in user-friendly spreadsheets with search and sort capabilities.

Criteria summary reports are also available, and define how the project scores were generated for each mode.

STI Mode Scores and Criteria

The Strategic Transportation Investments (STI) Law (House Bill 817) allows NCDOT to maximize North Carolina’s existing transportation funding to enhance the state’s infrastructure and support economic growth, job creation and high quality of life. STI establishes the Strategic Mobility Formula, a new way of allocating available revenues based on data-driven scoring and local input.

STI Implementation Update

Between May 28 and August 28, each of our 14 transportation divisions held a minimum 30-day comment period, which included at least one public meeting. In September, engineers assigned the final Division Input Points based on comments received at those meetings. The data will be analyzed to determine final scores for individual projects.


Earlier in May, we released data for nearly 3,100 projects for highway and non-highway modes (Aviation, Rail, Bicycle and Pedestrian, Ferry and Public Transportation) across the state.

This initial data showed that STI would allow us to move forward with more projects using existing funds, which would ultimately create more jobs in North Carolina. Through STI, the number of projects we could schedule over the next 10 years would increase compared to the old formula:

New formula: 371 projects
Old formula: 175 projects
Difference: 196 additional projects

An additional 108 major projects are not subject to STI, because they were scheduled for construction before July 1, 2015. We will continue to move forward with those projects.

Local input points were assigned by the following groups:

  • Metropolitan Planning Organizations (MPOs);
  • Rural Planning Organizations (RPOs); and
  • Division engineers in each of the state’s 14 transportation divisions.

Both division engineers and MPOs and RPOs established clear methodologies for collecting public input and determining how they are going to assign local input points as required by law.

NCDOT combined the scores calculated by MPO/RPO members and division engineers to generate the total number of local input points for regional and division level projects.

Using the STI Project Viewer

The interactive map below shows all transportation projects evaluated through STI.

Users can zoom in to see any project on the map. They can click on the icons to view details about each project related to aviation, ferry, rail and public transportation. Clicking on blue lines will pull up information on bicycle and pedestrian projects, while clicking on green lines will bring up details about highway projects. Those details include a project description and cost, as well as its STI scores.

The map also offers a convenient way to save, send or print the information available for each project. Users can click on the “Project Data PDF” link in the pop-up box to access a PDF document containing project data, map and scores.

Please note: Sign in is not required to use the map. For more insight on how to use the map, read our tip sheet.

View larger map

Next Steps

Once all final project scores and rankings are established, the department will schedule the projects with the highest overall scores. Other required project scheduling considerations such as the completion of environmental and engineering plans, corridor spending caps, and federal and state funding restrictions will affect the specific time assigned to a project.

NCDOT will use the final project rankings generated by the new formula to create the next State Transportation Improvement Program (STIP). The department will circulate a draft of the STIP for public comment beginning in December 2014. It will be adopted by the N.C. Board of Transportation in June 2015.

The process continues to highlight NCDOT’s need to find additional funding sources to meet our state’s growing transportation needs. The total estimated cost to complete all projects submitted in the database is $70 billion.

Why STI Is Important

North Carolina is the fourth fastest-growing state in the country. At the same time, NCDOT’s major revenue sources – including the state gas tax and federal fuel tax share, the Highway Use Tax and DMV fees – no longer provide enough funding to pay for all the transportation improvements North Carolina needs to continue to thrive.

STI will allow us to use our existing resources more efficiently and effectively, helping us move forward with important projects to enhance mobility and revitalize communities throughout the state. The new process encourages us to think from a statewide and regional perspective while also providing flexibility to address local needs.

How It Works

The Strategic Mobility Formula funds projects in three categories:

Division Needs Category

Projects in this category will receive 30% of the available revenue, shared equally over NCDOT’s 14 Transportation Divisions, which are groupings of local counties. Project scores will be based 50% on data and 50% on local rankings by area planning organizations and the NCDOT Transportation Divisions.

Highway projects in this category are analyzed according to three criteria:

  • Congestion (20%)
  • Benefit/Cost (20%)
  • Safety (10%)

Regional Impact Category

This category will receive 30% of available revenue. Projects on this level compete within regions made up of two NCDOT Transportation Divisions, with funding divided among the regions based on population. Data makes up 70% of the project scores in this category. Local rankings will account for the remaining 30%.

Highway projects in this category are analyzed according to four criteria:

  • Congestion (25%)
  • Benefit/Cost (25%)
  • Safety (10%)
  • Accessibility/Connectivity (10%)

Statewide Mobility Category

This category will receive 40% of available revenue. The project selection process will be based 100% on data.

Highway projects in this category are analyzed according to five criteria:

  • Congestion (30%)
  • Benefit/Cost (30%)
  • Economic Competitiveness (10%)
  • Safety (10%)
  • Multimodal, Freight and Military (20%))

STI scoring, weights and criteria were developed in 2013 by a broad-based group of transportation professionals and stakeholders, adopted by the N.C. Board of Transportation and reported to the N.C. General Assembly.

NOTE: Statewide Mobility projects are also analyzed separately in the Regional Impact and Division Needs categories and can cascade down to those categories for funding if they are not funded in the Statewide Category. Regional Impact projects can also cascade down to the Division Needs category.

A project’s benefit/cost can be improved if funding is provided during the project submission phase through local entity contributions or tolling approved by the local planning organization. In addition, a bonus allocation of up to 50% will be returned to the contributing area for a subsequent project scored through STI.

Alternate Criteria

To provide more flexibility, STI allows regions and divisions to develop alternate criteria tailored to their individual needs. To do so, the Metropolitan Planning Organizations, Rural Planning Organizations and NCDOT Divisions within the region must unanimously agree to the alternate criteria.

Regions made up of NCDOT Divisions 1 and 4 and Divisions 2 and 3 chose to utilize this option and developed alternate Regional Impact and Division Needs criteria.


These photos show Governor McCrory and other state leaders explaining the benefits of the Strategic Mobility Formula during the April 18 announcement.