Final answer:
You must dim your high beams when you're within 500 feet of an oncoming vehicle to ensure road safety and prevent blinding the other driver.
Step-by-step explanation:
In driving, when you are approaching an oncoming vehicle, it's important for safety to dim your high beams to avoid blinding the other driver. According to most U.S. states' driving regulations, drivers must switch from high beams to low beams when they are within 500 feet of an oncoming vehicle. This helps to ensure that both drivers can see clearly and maintain safe control over their vehicles. When driving at nights or in low-visibility conditions, always ensure to follow these guidelines to promote road safety for all.