What is the function of your vehicle’s high-beam assist during hours of darkness?

Your answer is correct because high-beam assist automatically switches your vehicle's high beams on when it is dark enough and conditions are suitable to improve visibility. It also automatically dims the high beams when it detects oncoming traffic or vehicles ahead, preventing glare that could blind other drivers. This system helps you drive safely at night without manually switching the high beams on and off. The option about cleaning the headlamp is not related to high-beam assist but to headlight washers.