SERIALIZATION OF VEHICLE CONTROL AT INTERSECTIONS IN OLDER DRIVERS

Area of Science:

• Gerontology
• Human Factors Engineering
• Transportation Safety

Background:

• Intersection negotiation is a complex driving task demanding integrated perception, attention, and motor control.
• Age-related declines in these cognitive and motor functions can impair driving performance, especially in challenging scenarios.
• Older drivers often exhibit modified driving strategies to manage age-related limitations.

Purpose of the Study:

• To investigate age-related differences in intersection negotiation strategies, specifically focusing on speed and heading control during right turns.
• To identify compensatory mechanisms employed by older drivers to manage age-related declines in driving abilities.
• To analyze the impact of control strategy on attentional demands during intersection negotiation.

Main Methods:

• Analysis of driving behavior in an instrumented vehicle, focusing on right turns at intersections.
• Comparison of steering and acceleration patterns between older and younger drivers.
• Quantification of speed and heading control synchronization.

Main Results:

• Significant differences observed in how drivers of different ages synchronize speed and heading control during right turns.
• Older drivers performed a greater proportion of their steering maneuvers while stationary compared to younger drivers.
• Younger drivers integrated steering more effectively with acceleration, indicating parallel control, while older drivers utilized serial control.

Conclusions:

• Older drivers adopt a "serialization" strategy for turning at intersections as a compensatory mechanism for age-related declines.
• This shift from parallel to serial control reduces attentional demands by minimizing the need to switch between driving sub-tasks.
• Understanding these adaptive strategies is crucial for developing effective interventions and technologies to support older driver safety.