When is it permissible for drivers to use only parking lights while driving?

Using only parking lights while driving is not permissible because parking lights are designed for stationary vehicles to increase visibility when parked, especially in low-light conditions. They do not provide sufficient illumination for safe navigation on the road. When driving, it is important to have full headlights activated to ensure that both the driver and other road users can see and react appropriately to each other, particularly in dim lighting or poor weather conditions. This requirement helps prevent accidents and maintain safety on the road, which is why relying solely on parking lights while driving is not allowed.