Under what condition is it not allowed to drive with bright headlights?

Driving with bright headlights, also known as high beam headlights, is not allowed in residential areas primarily because these lights can cause significant glare and discomfort to other drivers and pedestrians. High beams are designed to illuminate far down the road and are much brighter than low beams. In areas with houses, parked cars, and people walking on the streets, using bright headlights can lead to dangerous situations, as it reduces visibility for those who might be momentarily blinded by the light.

In contrast, the other conditions listed have different implications for headlight use. Driving in foggy conditions, for instance, is often safer with low beam or fog lights to reduce the amount of light that reflects off the fog and back into the driver's eyes. During the day, while high beams can sometimes be used if visibility is very poor, they are generally not necessary and can be considered inappropriate if they dazzle other drivers. In heavy traffic, the same principle applies—using low beams minimizes glare and reduces the risk of impairing other drivers' ability to see.

Thus, the specific scenario of residential areas stands out as a context where the use of bright headlights is clearly discouraged for the safety and comfort of the community.