Off-System Public Roads Annual Average Daily Traffic (AADT) Estimation Study

Details

• Creators:
  Hylton, Peter ; Miller, Bryce C
• Corporate Creators:
  High Street Consulting Group (HSCG)
• Corporate Contributors:
  Idaho Transportation Department ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Annual average daily traffic
  • Traffic volume
  • Traffic estimation
  • Interpolation
  • Federal aid highways
  • Non-Federal aid highways local roads
• Publication/ Report Number:
  FHWA-ID-23-303, RP-303
• Resource Type:
  Tech Report
• Geographical Coverage:
  Idaho ; United States
• Edition:
  Final Report 12/01/2022 – 02/28/2023
• Corporate Publisher:
  Idaho Transportation Department
• Abstract:
  This report describes a process to estimate AADT on non-Federal-Aid public roads (collectively called “off-system” roads) in Idaho. This will provide additional data for ITD and regional and local transportation agencies to conduct analysis, and it will meet new federal requirements for estimating AADT on all public roads. The report includes a review of AADT estimation approaches in research and in practice, documentation of ITD’s current AADT estimation process, and summaries of federal guidance. It also includes an inventory of potential data sources. The project team proposed three methods (related to regression, travel demand models, and geospatial interpolation), and the technical advisory committee (TAC) selected the geospatial interpolation approach based on its flexibility, understandability, moderate technical requirements, and accuracy. Therefore, this report also details how to implement the geospatial interpolation method for estimating off-system AADT. Some methodological decisions remain to be made based on the data (such as the specific geospatial interpolation technique and variables to include), so the report describes the decisions to be made and how to approach them. Finally, the report provides an implementation and validation plan with next steps, implementation roles, schedule, and statistics for use in model validation. This process can be implemented using tools in Esri ArcGIS and Python.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/68684/dot_68684_DS1.pdf
• File Type:
  [PDF - 1.69 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:64aa7132041b0f460a980ef6c7ad41a63e4e6068fbb4cb208a245e9a78c5abdb3c5ae90c0511f21fde886b24755c96208cda5f076c536254f8ca168ea0c82159