Why type of lighting should cars use when parked on the highway at night?

When parked on the highway at night, cars should use their hazard lights to alert other drivers of their presence. This flashing light signals that the vehicle is stationary and may pose a potential hazard. Additionally, parking lights can be activated if the vehicle is safely off the road, providing further visibility without being overly distracting. It's essential for safety to ensure that the vehicle is as visible as possible to prevent accidents.