Using Simulation to Better Understand the Effects of Aging on Driver Visibility

Area of Science:

• Human Factors Engineering
• Gerontology
• Automotive Safety

Background:

• Older drivers represent a growing demographic with unique physiological considerations.
• Assessing driving safety for older adults requires understanding how physical limitations affect vehicle interaction.
• Limited neck range of motion (ROM) is a common impairment in older populations that can affect driver awareness.

Purpose of the Study:

• To explore virtual simulation as a method for quantifying blind-spot line-of-sight in older drivers.
• To investigate the impact of neck range of motion (ROM) and avatar size on blind-spot visibility.
• To inform vehicle design considerations for enhancing older adult driver safety.

Main Methods:

• Utilized Siemens Jack software and virtual reality to simulate blind spots.
• Created eight older driver avatars (male/female, small/large height percentiles) with normal (65°) or abnormal (50°) neck ROM.
• Modeled a Volkswagen Beetle to analyze left and right blind-spot line-of-sight.

Main Results:

• Average line-of-sight loss between blind spots was 22.3% with normal neck ROM and 10.4% with abnormal neck ROM.
• Avatars with abnormal neck ROM experienced a greater reduction in line-of-sight, indicating increased blind spots.
• The study quantified the direct relationship between reduced neck ROM and impaired visibility for older drivers.

Conclusions:

• Older drivers with impaired neck ROM are at a higher risk for blind-spot related driving hazards, particularly on the left side.
• Virtual simulation is a viable method for assessing driver visibility and identifying safety concerns related to age-related physical changes.
• Vehicle design modifications should consider the impact of reduced neck mobility to improve safety for the aging driver population.