In which of the listed cases is it necessary to turn on the hazard warning lights?

• 1In the case of any stopping on the road.
• 2In the case of stopping at a police officer's demand.
• 3In the case of stopping due to the driver being blinded by the light of the headlights.
• 4Answers 2 and 3.
• 5Answers 1, 2, and 3.