Which factor can cause vision obstruction while driving?

Foggy weather is indeed a significant factor that can cause vision obstruction while driving. When the atmosphere is filled with moisture droplets, visibility can be dramatically reduced, making it difficult to see other vehicles, road signs, or obstacles. Fog can create a uniform grayness that blurs the landscape, impeding a driver's ability to judge distances accurately and respond to changing conditions.

While other factors, such as bright sunlight and nighttime driving, can also affect vision, fog presents a unique challenge because it can obscure details and drastically limit sight distance, which is crucial for safe driving. Texting while driving can distract a driver, but it does not inherently obscure vision in the same way that fog does. Thus, foggy weather stands out as a primary concern when discussing factors that lead to vision obstructions on the road.