What factor is NOT related to good driver vision?

Good driver vision is crucial for safe driving, and several factors play a significant role in ensuring that a driver can perceive their environment effectively. These factors include contrast sensitivity, glare recovery, and visual field of view.

Contrast sensitivity is the ability to distinguish objects from their background under different lighting conditions. It is essential for detecting pedestrians, road signs, and other vehicles, especially in low-light conditions.

Glare recovery refers to the time it takes for a person's eyes to adjust after being exposed to bright lights, such as headlights from oncoming traffic. A quick glare recovery allows drivers to regain their vision and respond to road conditions promptly after being momentarily blinded by glare.

The visual field of view encompasses the entire area a driver can see while looking straight ahead, including peripheral vision. A broad visual field allows a driver to be aware of their surroundings and react to potential hazards effectively.

In contrast, reference speed pertains to how fast a driver feels they are moving in relation to their surroundings. While having a good sense of speed is important for safe driving, it is not directly related to the visual capabilities that influence good driver vision. Thus, reference speed does not affect a driver's ability to see and interpret their surroundings, making it the factor that is not related to