• Driver monitoring camera or driver monitoring camera LED is covered
• Vehicle is driven in posture covering steering wheel
• Glasses or sunglasses are worn
• A part of eye is covered by cap or bangs, or part of face is covered by face mask
• Lighting conditions are largely changed (backlight from setting sun, light from side, direct light, and headlights of vehicles approaching from opposite direction)
• Driver is driving with face largely tilted to the side
• Driver is moving around significantly
• Driver frequently turns face or gazes away from front (forward direction)