SOLID LINES
A SOLID line usually indicates that crossing the line is discouraged. [MUTCD Section 3A.01] Edgelines are SOLID lines [MUTCD Section 3B.06], and a lane line is a SOLID WHITE line in portions of a road where lane changing across the line is discouraged. [MUTCD Section 3B.04]
A DOUBLE SOLID WHITE line indicates that lane changing (among lanes going in the same direction) is prohibited. [MUTCD Section 3B.04]
In the case of lines used to designate no-passing zones, a SOLID YELLOW line immediately to the left of your lane indicates that crossing the centerline to overtake and pass another vehicle is prohibited.
A DOUBLE SOLID YELLOW line indicates that passing is prohibited in both directions on an undivided road or highway.
Next - Broken Lines
