Under what circumstance is it prohibited to use bright lights?

Using bright lights, also known as high beams, is prohibited in built-up areas primarily because of the potential glare they create for other drivers, pedestrians, and cyclists. In urban environments, where lighting from streetlights and buildings is already present, the additional brightness from high beams can be blinding and disorienting. It is important to ensure safety for all road users in these settings, which is why the law prohibits the use of bright lights in built-up areas.

In contrast, when there is no other traffic or while driving on a highway, the use of bright lights may be appropriate as it can enhance visibility in dark or poorly lit environments, provided there is no risk of affecting other road users. Driving slowly is also not a scenario that inherently requires the use of low beams; however, it does not specifically align with the regulations regarding the use of bright lights. Thus, using bright lights is more about the safety considerations necessary in places with higher rates of pedestrian and vehicular interaction, such as built-up areas.