Hawaii Drivers Permit Practice Test

A solid white line on a four-lane divided highway is primarily used to indicate that lane changes are discouraged but could be permissible under certain circumstances, such as when navigating around a hazard. This marking is intended to promote safety by alerting drivers that crossing the line is not advisable, except in unusual situations where it is necessary and safe to do so. Thus, drivers should approach any crossing of a solid white line with caution and ensure that it can be done safely without endangering themselves or others.

In contrast, a solid white line differs from a dashed line, which allows for lane changes under typical circumstances. Solid lines also do not serve the purpose of separating traffic moving in opposite directions; that function is typically served by a solid yellow line. Therefore, understanding the role of solid white lines helps drivers make informed decisions about lane changes and contributes to overall road safety.