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A dashed white line between lanes means lane changes are allowed when it’s safe. It marks lanes moving in the same direction and lets you cross into the adjacent lane if there’s enough space and no danger to other drivers. Remember to signal, check mirrors and blind spots, and only move when you have a clear gap. Crossing the dashed line isn’t about driving on the line itself—it's about transferring from one lane to another safely. Solid lines, in contrast, indicate you shouldn’t change lanes. The idea of stopping before crossing lines doesn’t apply to this marking.