How can using a phone while driving fundamentally alter a driver’s performance?

Using a phone while driving fundamentally alters a driver’s performance by decreasing focus on driving. Engaging with a phone requires cognitive, visual, and manual attention that diverts a driver’s focus away from the road and their immediate environment. This distraction can lead to slower reaction times, impaired judgment, and an increased risk of accidents because the driver's ability to process information relevant to driving is compromised.

When a driver is focused on their phone, they may miss crucial visual cues, such as traffic signals, pedestrians, or changing road conditions that are critical for safe driving. This lack of focus means that the driver is not fully aware of their surroundings, making it much more difficult to react appropriately to potential hazards. Overall, decreased focus on driving due to phone usage significantly impacts driving performance and safety on the road.