Guide on Using Alternative Data Sources for a Texas Speed Zone Study, Updated

Details

• Creators:
  Fitzpatrick, Kay ; Kutela, Boniphace ; Pratt, Michael P. ; Park, Eun Sug
• Corporate Creators:
  Texas A&M University. Texas Transportation Institute
• Corporate Contributors:
  Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Speed zones
  • Traffic data
  • Speed data
  • Urban highways
  • Case studies
  • Speed limits
  • Speed zone studies
  • 85th percentile speed
  • roadway data
• Publication/ Report Number:
  FHWA/TX-26/0-7156-01-P1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• Edition:
  September 2022-July 2026
• Corporate Publisher:
  Texas Transportation Institute. Texas A&M University
• Abstract:
  Within Texas, the Texas Department of Transportation Procedures for Establishing Speed Zones (TxSZ) and the Texas Manual on Uniform Traffic Control Devices (TxMUTCD) are used for setting speed limits other than statutory speed limits. The TxSZ details how to conduct an engineering study that is needed when investigating the appropriate speed limit for a speed zone. The objective of this guide is to provide methods and examples on how to use alternative sources of data when evaluating speed limits. It does not replace the material in the TxSZ or the TxMUTCD. Rather, it provides suggestions on how INRIX speed data can be used in an engineering study required in a speed zone study and demonstrates other supplemental methods and guidance when conducting a speed zone study. It provides step-by-step instructions on how to obtain the INRIX speed data, convert into representative free-flow speed measures, and use them in both the TxSZ method and the Speed Limit Setting Tool. The 2026 version of the guide includes additional case studies along with updated instructions on obtaining INRIX speed data.
• Format:
  PDF
• Funding:
  0-7156-01
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/93246/dot_93246_DS1.pdf
• File Type:
  [PDF - 4.59 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:64d9b8642db3da4ac308bf0b242ec1b94503c0e960cf94d2ab893830bff1dcba7143fb3c1e29b6ab78c9e66e82029ba0b0364089299c70b4510f7b10242ed277