What is Visibility Distance (Görüş Mesafesi)?\n\nVisibility distance refers to the maximum length of road ahead that a driver can clearly observe at any given moment. In the Turkish driving theory exam (ehliyet sınavı), understanding this concept is crucial for safe vehicle operation. It is not a fixed number; rather, it constantly changes based on weather conditions, light levels, and the geometry of the road. Maintaining high situational awareness of your changing visibility distance is a cornerstone of defensive driving.\n\n## The Golden Rule of Road Safety\n\nThe most important principle regarding visibility is simple: you must always be able to stop safely within the distance you can see. If your visibility distance is 50 meters, your total stopping distance (the combination of your reaction distance and braking distance) must be less than 50 meters. If you drive faster than this limit, you are effectively 'driving blind,' meaning you will not have enough space to brake if an obstacle suddenly appears.\n\n## Factors Affecting Your Sight on Turkish Roads\n\nSeveral environmental and physical factors can severely restrict how far you can see:\n- Weather Conditions: Fog, heavy rain, and snowfall introduce suspended particles in the air, creating a physical barrier to light.\n- Road Layout: Sharp curves, hill crests, and slopes limit your forward view. On winding mountain passes in Türkiye, a corner can instantly cut your visibility distance to a few meters.\n- Night Driving: At night, your visibility is entirely dependent on your vehicle's headlights. Turkish traffic laws dictate that low beams must illuminate at least 25 meters, and high beams at least 100 meters.\n\n## Visibility Distance vs. Blind Spots (Kör Nokta)\n\nLearners often confuse visibility distance with blind spots (kör nokta), but they are entirely different concepts. While visibility distance refers to your line of sight on the road ahead, a blind spot is the physical area around your vehicle that cannot be seen directly or through your rearview and side mirrors. To compensate for a limited visibility distance, you must adjust your speed. To compensate for blind spots, you must perform shoulder checks and properly adjust your mirrors before changing lanes or turning.