Is a driver allowed to sound the horn while driving in a built-up area at night?

The correct answer indicates that a driver is allowed to sound the horn while driving in a built-up area at night, but only in emergencies during specific hours. This is based on road safety regulations that aim to minimize noise pollution in residential areas during nighttime when people are likely trying to sleep. Using the horn in emergencies helps ensure safety, as the driver can alert other road users to potential dangers. However, the restriction during specific hours emphasizes that while the horn may be necessary for safety, it must be used judiciously to avoid disturbing the peace in populated areas.

Other options suggest broader contexts where horn usage is either unrestricted or limited to certain scenarios. However, the regulations prioritize safety while also considering the well-being of the community, making the specified conditions necessary and appropriate for night driving in built-up areas.