In some areas, especially in Canada, this is the law. Rain and fog, too, are a time for headlights, as well as twilight. Some drivers have a very limited view of the role of headlights or a misguided desire to conserve power, as they delay turning on car lights in the evening as long as possible. But, a critical issue is how well others can see us. Twilight is the time of most accidents.
Drivers are tired after a day of activity.
Some have stopped for an after work drink or two or three and have impaired focus. Others, anxious to get home, rush too quickly. The rule is to help these people to see us and to avoid us. Be amongst the last to turn off lights in the morning and amongst the first to turn them on in the evening, if not driving with lights on all the time. If another driver does not seem to have noticed us, and it looks as if he might hit us, blinking the headlights may be a big help.