Final answer:
Laws generally require the use of headlights from sunset to sunrise, during rain, snow, sleet, or fog, and when visibility is under 500 feet. Variations in law exist by jurisdiction, so it's vital to know local rules.
Step-by-step explanation:
The law dictates that you are required to use your headlights during certain conditions to ensure visibility and safety on the road. Typically, you must turn on your headlights from sunset to sunrise, during any period of rain, snow, sleet, or fog, and whenever visibility is less than 500 feet. Specific laws may vary by jurisdiction, but these guidelines provide a general rule for when headlights should be used. Additionally, some states have a "wipers on, lights on" policy, meaning whenever your windshield wipers are in continuous use, your headlights must also be active. It's important for drivers to be familiar with and adhere to their local traffic laws to maintain a safe driving environment.
Nighttime: It is a legal requirement to use headlights during the hours of darkness, usually defined as the period from sunset to sunrise. Some jurisdictions may specify the exact times.
Low Visibility: Headlights are often required during conditions of reduced visibility, such as rain, snow, fog, or any other atmospheric conditions that make it difficult to see other vehicles or be seen by them.
Inclement Weather: Even during the daytime, some jurisdictions may require drivers to use headlights when weather conditions such as heavy rain or snow reduce visibility.
Tunnel Use: In tunnels, where natural light may be limited, the use of headlights is typically required.
Certain Times of Day: In some places, it may be required to use headlights during dawn and dusk when lighting conditions can be challenging.