When is it required to use headlights in Illinois?

In Illinois, it is required to use headlights anytime the windshield wipers are in use. This regulation is in place because using windshield wipers typically indicates that there are adverse weather conditions, such as rain or snow, that can reduce visibility. By requiring headlights to be on in such conditions, it enhances visibility for both the driver and other road users, thereby improving safety on the roads.

Using headlights not only helps the driver see the road better during inclement weather but also allows other motorists to see the vehicle more clearly, reducing the chances of accidents. This law emphasizes the importance of proactive safety measures while driving in changing weather conditions.

The other options, such as using headlights only at night or in foggy conditions, do not capture the full scope of when headlights should be utilized to ensure safety. Parking regulations are separate from driving safety requirements regarding visibility, further indicating the comprehensive coverage of the headlight use law in adverse weather situations.