A solid white line indicates the outer edge of a roadway, and it may be crossed only by traffic moving to or from the shoulder.

 A solid white line indicates the outer edge of a roadway, and it may be crossed only by traffic moving to or from the shoulder.

The right edges of many roadways are marked with a solid white line. This line indicates the outer edge of the roadway, and it may be crossed only by traffic moving to or from the shoulder. The left edge is marked with a yellow line.