On a four-lane highway, what is true about a double solid white line?

A double solid white line serves as a crucial traffic control device used to indicate that crossing the lines is prohibited. This means that drivers are not allowed to change lanes or pass vehicles when a double solid white line is present. The purpose is to promote safety by preventing traffic from moving between lanes in areas where it may be deemed dangerous or impractical.

In addition to this functionality, the presence of double solid white lines can indicate a variety of situations, such as special lanes for buses or bicycles, or areas where lane changes could create hazards due to road conditions or traffic patterns. Thus, adhering to this rule is essential for maintaining order and safety on the roadway.