What is the relationship between speed and the driver's field of vision?
A)The higher the speed, the greater the visual field.
B)The lower the speed, the smaller the visual field.
C)The higher the speed, the smaller the visual field.Correct
The speed of a vehicle causes a notable reduction in the useful visual field, so that the higher the speed, the more the visual field is reduced. For example, the maximum angle of the horizontal visual field decreases by approximately 25% when the vehicle's speed is 35 km/h. If this speed increases to 100 km/h, the reduction in the visual field reaches more than 70% and the so-called tunnel effect occurs.
The tunnel effect is when we lose all peripheral vision and can only see the centre of the road clearly.