During what hours may a driver sound their horn in built-up areas for emergencies?

In built-up areas, the law restricts the use of vehicle horns primarily to emergencies. The correct answer indicates that the horn can be sounded specifically between 11:30 pm and 7:00 am to minimize disturbance to residents. This timeframe aligns with typical night hours when people are likely to be sleeping, making it important to avoid unnecessary noise during these early morning and late-night hours unless it's an emergency situation that requires immediate attention.

According to road safety regulations, using the horn outside of these designated hours for non-emergency situations is generally discouraged in order to maintain peace and order in residential areas.