Development of Guidelines for Implementing the Flipped Left Diamond Interchange Design

This research is to investigate the operational performance of an innovative interchange design, Flipped Left Diamond Interchange (FLDI). FLDI can improve the capacity of the interchanges by minorly modifying of interchange geometric design. This modification does not require major construction and will overcome the problems in existing innovative interchange designs. However, because FLDI is a very new design, no study has been conducted to investigate the operational and design issues in the implementation. This study is to fill this gap and to promote and facilitate the implementation of this innovative design in the future. This research will also investigate the design issues in the implementation of the FLDI design and identify the applicable conditions for this new interchange design. The specific objectives of this research are as follows: (1) Analyze the impact of FLDI on the operational performance of a diamond interchange to determine if the implementation of FLDI can reduce the overall intersection delay and traffic congestion in comparison to a traditional diamond interchange. (2) Develop signal timing strategies for the FLDI design. (3) Investigate the design issues in the implementation of the FLDI design and develop strategies to address them. These design elements include traffic signs, signal displays, pavement markings, roadway delineators, etc. (4) Determine the applicable traffic conditions for implementing the FLDI design. (5) Conduct equity analysis of the FLDI design. To ensure the FLDI design will benefit all socioeconomic groups, a driver occupancy survey will be conducted among different socioeconomic groups.


  • English


Subject/Index Terms

Filing Info

  • Accession Number: 01897932
  • Record Type: Research project
  • Source Agency: Connected Communities for Smart Mobility Towards Accessible and Resilient Transportation for Equitably Reducing Congestion (C2SMARTER)
  • Contract Numbers: 69A3551747124
  • Files: UTC, RIP
  • Created Date: Oct 30 2023 10:58PM