Commercial Driver License (CDL) Class B Practice Test

Using low beams is not appropriate in all driving conditions. Low beam headlights are designed for use in specific situations, particularly when visibility is low but there is oncoming traffic. However, there are circumstances where high beams are preferable. High beams illuminate further down the road and are useful on rural roads or in areas with little to no ambient light when no other vehicles or street lights are present. In contrast, low beams should be employed when you're driving in fog, rain, or snow to avoid the light reflecting back into your eyes, which can happen with high beams. Therefore, the assertion that low beams must always be used is not accurate, as the use of high beams can enhance safety and visibility in certain conditions. Understanding when to switch between low and high beams is crucial for safe driving.