Table of Contents

4.1 Relevance to the driving task

4.1.1 Effect of hearing loss on driving

The evidence base regarding hearing loss and driving safely is limited; however, the analysis of the small number of quality studies report that hearing loss has no effect on motor vehicle crash risk.1 It may be that a loss of hearing is well compensated for since most people who are hard of hearing are aware of their disability and therefore tend to be more cautious and rely more on visual cues and other sensations such as vibrations. Functional hearing is used in the driving task to:

  • sense alarms, notifications and other auditory cues in the driving environment (e.g. railway crossings, first responder sirens)
  • sense auditory cues on the state and position of the vehicle from vehicle technology systems (e.g. alarms, warning systems using sound alerts)
  • compensate for comorbidities or general reduction in functional abilities that may impair driving (e.g. slower reaction times, reduced neck rotation due to musculoskeletal changes)
  • assist in maintaining general vigilance, alertness and arousal.

See references 1,2,3,4,5,6,7

4.1.2 Considerations for commercial vehicle drivers

While driving ability per se might not be affected by a hearing loss, responsiveness to critical events is an important safety consideration for drivers of commercial vehicles. These drivers therefore require the capacity to ensure safety and the capacity to respond to environmental situations that may involve sirens, rail crossings and emergency signals as well as conditions of the vehicle and roads. It may be challenging to rely solely on vision to compensate for a significant hearing loss in a commercial vehicle. The internal commercial vehicle cabin can place additional attentional, workload and visual demands on drivers for undertaking tasks such as checking multiple displays or monitors and using communication systems. These additional tasks reduce capacity to compensate for a lack of hearing by relying on vision to monitor the external environment.

See references 8,9