What must a driver do when approaching a high-beam and low-beam switch under Title 21?

When approaching oncoming traffic, a driver is required to switch to low beams. This regulation is designed to prevent glare that can blind other drivers and create hazardous conditions. High beams produce a bright light that can significantly impair the vision of oncoming drivers, making it difficult for them to see the road and other vehicles clearly. Switching to low beams helps ensure the safety of everyone on the road by providing adequate lighting without causing visual discomfort to others.

Maintaining high beams at all times would not only be unsafe but also violate the traffic regulations aimed at promoting road safety. Using high beams unnecessarily can endanger the safety of oncoming vehicles. Similarly, using high beams solely to illuminate the area is inappropriate when other vehicles are present, as it disregards the need to prevent glare for others. Low beams are particularly effective for night driving on highways and in urban settings, but the rule emphasizes their use when there's potential risk due to oncoming traffic.