Principal Components Analysis of Driving Simulator Variables in Novice Drivers

Area of Science:

• Human Factors
• Transportation Psychology
• Simulation Technology

Background:

• Driving simulators offer valuable insights into driving behaviors but lack standardized metrics for cross-study comparisons.
• Inconsistent reporting of driving variables hinders the reliability and generalizability of simulator research findings.
• Establishing core driving variables is crucial for advancing our understanding of safe driving and informing driver training programs.

Purpose of the Study:

• To derive empirically and theoretically meaningful composite scores from young drivers' behaviors in a high-fidelity driving simulator.
• To establish consistent metrics for assessing driving behavior across diverse simulated driving environments.
• To provide a foundation for developing standardized benchmarks in driving simulator research.

Main Methods:

• One hundred ninety adolescent participants (16 or 18 years old) completed a driving task in a high-fidelity simulator.
• The simulation included four distinct environments: Urban, Freeway, Residential, and a Car Following Task (CFT).
• Principal Components Analysis (PCA) was used to identify underlying composite variables from simulator output across and within environments.

Main Results:

• Across all simulated driving environments, PCA identified two primary components: vehicle control and speed.
• Within individual driving environments, PCA revealed two distinct components: vehicle control and tactical judgment.
• These composite scores offer a more concise and meaningful representation of driving behavior.

Conclusions:

• The derived composite scores represent a significant step towards quantifying theoretical constructs of driving behavior in simulation.
• This research addresses the current lack of standardized 'gold standard' scores for driving behavior and performance in simulators.
• These composite variables hold potential for establishing benchmarks in clinical practice, driver training, and parental assessment of novice drivers.