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Question:

What is meant by "Drive within the range of your headlights?"

A Drive at a speed that lets you stop safely within the distance that your headlights can illuminate.
Explaination

"Driving within the range of your headlights" means driving at a speed that lets you stop safely within the distance that your headlights can illuminate. Your high-beam headlights can light the road up to 350 feet ahead. At 60 mph, your vehicle will travel 350 feet in just four seconds. If there is a hazard more than 350 feet ahead, you may not be able to see it in time to avoid it. To give yourself more time to react, slow down.