Which range best describes the useful field of view for a typical driver (horizontal arc centered on the driver's face)?

• A. 5-10 degrees
• B. 60-90 degrees
• C. 20-30 degrees
• D. 90-120 degrees

Answer: (C)

The useful field of view in driving is the portion you can process quickly and accurately without moving your head. For a typical driver, this high-detail zone sits about 20–30 degrees to either side of your straight-ahead gaze. Within this arc you can recognize hazards, read signs, and decide how to respond with minimal delay. Beyond that range, you still see objects in your peripheral vision, but details fade and reaction time increases unless you turn your eyes or head to bring them into that central strip. So, a 20–30 degree arc best captures the level of quick, reliable processing needed for safe driving, while much wider ranges (60–90 or 90–120 degrees) overestimate the amount of detail you can reliably use without shifting focus, and an extremely narrow 5–10 degree range underestimates the area you can still monitor effectively.