Final answer:
When someone is within 500 feet of you, you must dim your high beams. When you are 200 feet behind someone, you must also dim your high beams.
Step-by-step explanation:
When someone approaching you is within 500 feet of you, you must dim your high beams. When you are 200 feet behind someone, you must also dim your high beams. Dimming your high beams reduces glare and improves visibility for other drivers.