Headlights must be turned on:

Question: Headlights must be turned on:

Answer options:

• Only at night ✅ From dusk to dawn and whenever visibility is poor
• Only in winter
• Only in fog

Correct answer: From dusk to dawn and whenever visibility is poor

Explanation: Under the Quebec Highway Safety Code, headlights must be switched on from dusk to dawn and whenever atmospheric conditions, such as rain, snow, or fog, reduce visibility. The correct option is accurate because it encompasses both nighttime hours and poor daytime driving conditions. Restrictive choices containing "only" are incorrect because they fail to account for the full spectrum of legal scenarios requiring headlight use. This rule ensures drivers can see and be seen in all low-light situations. On the SAAQ knowledge test, questions about headlight use are common, highlighting the exam's focus on proactive hazard prevention and vehicle visibility.