What Are Daytime Running Lights (Gündüz Farı)?

Daytime running lights (DRLs), known as gündüz farı in Turkish traffic terminology, are forward-facing vehicle lights that automatically illuminate when the engine is started. Unlike headlights, which are designed to illuminate the road ahead for the driver, the primary purpose of DRLs is to make your vehicle more conspicuous to other road users, including oncoming motorists, cyclists, and pedestrians, during normal daylight conditions.

Originally developed for high-latitude countries with low daytime ambient light, DRLs are now a standard safety feature globally and are integrated into Turkish vehicle equipment requirements. They are usually low-energy LED lights designed to offer high visibility without creating glare or consuming excessive fuel or battery power.

Key Differences Between DRLs and Standard Headlights

A critical concept for Turkish driving theory candidates is understanding the distinction between daytime running lights and regular headlights. This distinction is vital for answering exam questions correctly and staying safe on the road:

• Intention and Direction: DRLs are designed to help other people see your vehicle, not to help you see the road. Regular headlights (both low-beams and high-beams) are designed to illuminate the path ahead for the driver.
• Rear Lighting: In almost all vehicles, daytime running lights only activate the front lights. When DRLs are active, the rear position lights (tail lights) remain switched off. Standard headlights activate both front and rear lights simultaneously.
• Light Output: DRLs are bright enough to draw attention during the day but lack the focused beam pattern required to navigate safely in the dark.

Turkish Highway Traffic Regulations on Daytime Lighting

According to the Official Turkish Highway Traffic Regulation published by the General Directorate of Highways (KGM), drivers are legally required to use appropriate lighting depending on environmental conditions. While DRLs are highly effective on clear days, they are legally and practically insufficient in the following situations:

• Tunnels: When entering any highway tunnel in Turkey, you must manually switch from DRLs to low-beam headlights. Since DRLs do not activate rear tail lights, entering a tunnel with only DRLs active makes your vehicle virtually invisible from behind, which is a major hazard.
• Dusk and Nighttime: As ambient light fades, you must switch on low-beam headlights. Relying on DRLs at night is highly dangerous and illegal under Turkish law.
• Adverse Weather: During heavy rain, fog, or snowstorms, DRLs do not provide adequate front illumination or rear visibility. In these conditions, fog lights or low-beam headlights must be activated.

Daytime Running Lights in the MTSK Theory Exam (Ehliyet Sınavı)

In the Turkish driving licence electronic exam (MTSK e-sınav), vehicle technique and traffic safety questions frequently test your understanding of lighting systems. Here are the most common exam traps and concepts to remember:

• The "Rear Lights" Trap: A common exam question asks whether daytime running lights illuminate the rear of the vehicle. The answer is no. Always remember that tail lights do not turn on with DRLs.
• Tunnel Regulations: You will likely face a scenario question asking which lights to turn on when entering a tunnel during the daytime. The correct answer is always low-beam headlights (kısa farlar), never daytime running lights.
• Energy Efficiency: Exam questions regarding vehicle maintenance or fuel efficiency sometimes mention DRLs. Because modern DRLs use LED technology, they consume minimal energy compared to driving with full low-beams on during the day.