If you've ever driven along a dark country road, you've probably experienced the routine of switching between high and low beams. High beams help illuminate the road ahead, but leave them on when another vehicle approaches, and you risk blinding its driver. Forget to switch them back on afterward, and you could miss important details in the darkness.
That's where automatic high beams come in. Available on an increasing number of modern vehicles, this technology handles the switching for you, using cameras and electronic controls to monitor the road ahead and react to changing conditions. But how does a car know when another vehicle is approaching? The answer is a little more interesting than you might expect.
