Evaluation of Driver Workload and Training Strategies on a Diverging Diamond Interchange

The amount of information processed by drivers in freeways and arterials increases significantly at interchanges. The information includes changes in alignment and number of lanes, lane position, merging and diverging from the main road, change of safe vehicle speed according to the alignment changes, and the need for attention to various types of road signs. Therefore, negotiating interchanges is a very complex and demanding task. Many studies have been looking at innovative designs to improve safety concerns while reducing urban congestion. One of those innovative intersections is the Diverging Diamond Interchange (DDI) that will be implemented for the first time in Puerto Rico in the state road PR-30 Km 4.1 in Gurabo, PR. Since this is the first time that this type of intersection is implemented in Puerto Rico, the proposed research study aims to determine which training strategy is better suited to effectively communicate drivers the correct way to drive along with this type of intersection. To assess the safety and operational effectiveness of the training strategies, a detailed study on how local drivers behave and the mental workload experienced when driving through the proposed DDI for the first time will be performed. A new factor included in this research is the drivers’ cognitive workload or brain workload. This variable will be evaluated using various biosensors, included with the dry-electrode DSI-24 EEG headset and the algorithms to measure workload that has been developed by the providers of this type of equipment. The comparison of the effect of the strategies will be evaluated using the driving simulator of UPRM. The identification of the best training strategies would allow state, local, and federal institutions to use them in their educational and awareness campaigns.


  • English


  • Status: Active
  • Funding: $24185
  • Contract Numbers:


  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Managing Organizations:

    University of Iowa, Iowa City

    National Advanced Driving Simulator, 2401 Oakdale Blvd
    Iowa City, IA  United States  52242-5003
  • Performing Organizations:

    University of Puerto Rico at Mayagüez

    Department of Civil Engineering and Surveying
    PO Box 9000
    Mayagüez PR 00681-9000, PR  United States  00681-9000
  • Principal Investigators:

    Valdes Diaz, Didier

    Colucci, Benjamin

    Figueroa, Alberto

  • Start Date: 20200601
  • Expected Completion Date: 20200831
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers

Subject/Index Terms

Filing Info

  • Accession Number: 01738855
  • Record Type: Research project
  • Source Agency: Safety Research Using Simulation University Transportation Center (SaferSim)
  • Contract Numbers: 69A3551747131
  • Files: UTC, RIP
  • Created Date: May 7 2020 12:37PM