What is a common reason for a driver to use hazard lights?

Using hazard lights is primarily intended to alert other drivers to a vehicle that is in a potentially dangerous situation or is creating a temporary hazard on the road. When a driver activates their hazard lights, it communicates to surrounding vehicles that they may need to exercise caution, as the driver's vehicle is not functioning normally or is pulled over for an emergency situation.

In the context of the given choices, using hazard lights when pulling over for an emergency effectively conveys the need for attention and caution from other road users. This action helps to prevent accidents by letting others know that the vehicle is stopped unexpectedly. Other reasons such as signaling being lost or attempting to express emotions to other drivers are not appropriate uses for hazard lights and do not align with the purpose of these indicators. Additionally, using hazards to attract attention unnecessarily can cause confusion and disrupt traffic flow.