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Analysis of driver behavior at grade-separated intersections to support design.
Yunmei Liu1, David Kaber2, Christopher Cunningham3
1Department of Industrial Engineering, University of Louisville, Louisville, KY, 40292, USA.
Applied Ergonomics
|April 16, 2024
Summary
Drivers face challenges with contraflow grade-separated intersections (C-GSI) due to reduced situation awareness (SA) and higher workload. Quadrant GSI (Q-GSI) with clear signage improved SA, offering a safer alternative for traffic control.
Area of Science:
- Traffic Engineering
- Human Factors
- Cognitive Psychology
Background:
- Effective roadway design requires understanding driver behavior in complex traffic scenarios.
- Driver cognitive workload and situation awareness (SA) are critical for safe navigation.
- Assessing different intersection designs is essential for improving road safety and efficiency.
Purpose of the Study:
- To analyze driver cognitive workload, SA, and performance across three intersection scenarios.
- To evaluate the impact of lane assignment sign manipulations on driver behavior.
- To identify design elements that enhance driver SA and manage cognitive workload.
Main Methods:
- A simulator-based driving experiment was conducted.
- NASA Task Load Index and Situation Awareness Global Assessment Technique were employed.
- Driver behavioral responses were assessed in standard, C-GSI, and Q-GSI scenarios.
Main Results:
- C-GSI scenarios led to diminished SA, elevated workload, delayed lane changes, and speeding.
- Q-GSI scenarios showed elevated workload but maintained SA due to effective lane-specific signage.
- Higher mental workload correlated with increased acceleration; better perceived performance linked to accurate lane-keeping.
Conclusions:
- Grade-separated intersections (GSIs) require careful design to support driver SA and manage cognitive load.
- Lane assignment signage significantly influences driver behavior and SA in complex intersections.
- Optimized GSI and signage designs are crucial for improving driver performance and road safety.
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