What factors influence the improvement of the field of vision?

In the photo, you are driving along an empty motorway with barriers on both sides, in misty weather; lorries can be seen in the distance. The factor that improves the field of view is reducing the vehicle's speed - answer B. Increasing speed (A) narrows it, and driver stress (C) limits it further.

The driver's field of view depends on how far ahead of the car the brain focuses its attention: at high speed your eyes are drawn into the distance, the picture from the sides blurs, and the driver sees as if through a tunnel. When you slow down, the point of focus moves closer again, and your eyes start to register the shoulders, the mirrors and what is happening in the neighbouring lanes - the field of view grows. Stress, tiredness and hurry work the other way: they narrow your attention to one problem and make you look but not see. The Road Traffic Act requires you to drive at a speed that ensures control over the vehicle, taking into account the visibility of the road and weather conditions, and to exercise particular caution in reduced visibility - so taking your foot off the accelerator improves not only safety, but also how much you see.

Legal basis: Art. 19 para. 1 and Art. 30 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)