Ace the Texas CDL General Knowledge Exam 2026 – Drive Your Future to Success!

Using low beams in fog, rain, or snow is essential for maintaining visibility and safety. High beams can reflect off precipitation or fog, causing a glare that actually reduces your visibility, making it more difficult to see the road and obstacles ahead. Low beams provide a wider and shorter light pattern that is more effective in these conditions, ensuring that the driver can see the road and any potential hazards while minimizing the glare that can impair both their vision and the vision of other drivers.

When driving on highways or in rural areas at night, high beams can be useful when there are no other vehicles nearby, as they illuminate a greater distance. However, they are not appropriate when conditions like fog or rain are present. Similarly, when following closely behind another vehicle, low beams should be used to avoid blinding the driver ahead with high beams, but fog, rain, or snow specifically warrant low beams to enhance safety and visibility.