_____ indicate the center of a two-way road used for two-way traffic.

Yellow lines indicate the center of a two-way road that accommodates traffic moving in opposite directions. The use of yellow lines is a standard practice in road marking, signaling to drivers that they must stay to their right of the line while being mindful that vehicles from the opposite lane are approaching.

In contrast, white lines are generally used to separate lanes of traffic moving in the same direction or to indicate the edges of the roadway. Red lines typically denote no-parking zones or restricted areas. Blue lines are often reserved for marking places for disabled parking. Thus, understanding the color coding of lines is crucial for safe navigation and compliance with traffic regulations.