Guidelines for Dual-Advisory Speed Signing on Freeway-to-Freeway Connectors in Texas

Details

• Creators:
  Voigt, Anthony P. ; Stevens Jr, Charles Robert ; Borchardt, Darrell W.
• Corporate Creators:
  Texas A&M University System. 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:
  • Freeway management systems
  • Freeway operations
  • Highway curves
  • Interchange ramps
  • Rollover crashes
  • Speed signs
  • Steering
  • Traffic speed
• Publication/ Report Number:
  FHWA/TX-07/0-4813-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• Corporate Publisher:
  Texas. Department of Transportation
• Description:
  This project recognizes the disparity in the relationship between truck and passenger car speeds and current advisory speed signing practices. The results of this project provide a mechanism that traffic engineers may use to provide enhanced differential warning to trucks and passenger vehicles at freeway connector maps. Considering the strong evidence that there is a significant differential between speeds that cars and heavy trucks can comfortable and safety traverse freeway connector ramps, there was a need for further research to investigate the current advisory speed signing practices and to examine whether a dual-advisory speed signing scheme, one that provides different recommended advisory speeds for trucks and passenger vehicles, can safely address this differential. Based on the results of the analysis of average and 86th percentile speeds at the midpoint of each study curve, the dual-advisory warning signs generally had a positive impact on reducing speeds at the point of curvature on the curve and/or having an accompanying reduction in speed-related crashes at the study site.
• Format:
  PDF
• Funding:
  0-4813
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88575/dot_88575_DS1.pdf
• File Type:
  [PDF - 1.85 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:b4b2fce5642aa6a45dc9e047e1aaff130020bc4717db315cfbdfe6a45e35bb78e7f993c219b2e0d021418b5b31a25328e9254af5a2a9d8d70e1be3bc08d138dc