What do white lane lines on a four-lane divided highway indicate?

White lane lines on a four-lane divided highway are used to designate and separate lanes of traffic that are moving in the same direction. This helps organize traffic flow and ensures that vehicles remain within their designated lanes, thereby reducing the potential for accidents and improving overall roadway safety. The presence of these lines informs drivers that they can safely change lanes as long as it is safe to do so, while maintaining their direction of travel.

In contrast, lines that separate lanes of traffic moving in opposite directions are typically painted in yellow, indicating the need for caution as vehicles travel towards one another. The white lines serve a distinct purpose, specifically catering to same-direction traffic, ensuring an efficient and orderly flow on the highway.