Final answer:
The correct distance to turn on hazard lights near a disabled vehicle depends on local traffic laws, which aren't provided in the question. Visibility calculations are unrelated to the safety guideline of turning on hazard lights.
Step-by-step explanation:
The question regarding the distance at which to turn on hazard lights near a disabled vehicle does not directly relate to the reference information provided about the resolution of headlights at a distance. The correct answer for when to turn on hazard lights when approaching a disabled vehicle will rely on regional traffic laws and guidelines. Typically, you should turn on your hazard lights to alert other drivers that you are experiencing a problem with your vehicle far enough in advance to ensure their safety and yours. Without specific legal guidelines presented in the question, none of the provided choices (400, 450, 500, 550 feet) can be substantiated as the correct distance.
However, addressing visibility, the average human eye can resolve two points as separate if they subtend an angular size of about 1 arcminute at the eye. This resolution ability can be applied to determine how far away a car can be for its headlights, which are typically about 1.3 meters apart, to be resolved by the human eye. Given that the pupil diameter is about 0.40 cm, calculations could be based on the Rayleigh criterion for a rough estimate of the resolving power of the human eye. Yet, providing a specific distance without performing this calculation isn't possible.