Do I need to turn on the width lights during the day?

[StCecilia]

Width lights are not required during the day. Width lights are mainly used to indicate the presence and approximate width of a vehicle, alerting oncoming and following vehicles to facilitate their judgment during encounters and overtaking. They are installed along the edges of the car's roof, with front lights being white and rear lights red. The main purposes of width lights are: 1. When temporarily parked by the roadside at night, width lights should be turned on; 2. On well-lit roads, they can serve as driving lights without needing headlights; 3. During rain, snow, fog, nighttime, or other conditions with poor visibility, width lights should be activated to alert passing vehicles.