Washington State Department Of Licensing Knowledge Practice Test

The correct choice is solid yellow lines, as they serve a specific purpose in traffic regulation. Solid yellow lines indicate that traffic should stay to the right, marking the left edge of one-way roads and separating opposing lanes of traffic. In this context, they provide guidance to drivers, reinforcing that they should not cross the line, which is particularly crucial where the traffic directions are different. This distinction is essential for maintaining safe movement on roads. Other line types, such as white lines, are used for separating lanes of traffic moving in the same direction or marking the edges of a roadway, which does not apply to one-way situations. Dashed white lines indicate that lane changes are permissible, and broken yellow lines often signal that passing is allowed when it is safe to do so, neither of which fits the description for marking the left edge of one-way roads. Hence, solid yellow lines are the appropriate choice for this particular function on roadways.