A solid lane line with a dashed lane line signifies a "partially restricted" or "conditionally restricted" passing zone. This means that passing is allowed on the side with the dashed line, but not on the side with the solid line. The solid line indicates that passing is not allowed on that side of the road, while the dashed line indicates that passing is allowed on that side of the road when it is safe to do so. Drivers should use caution and only pass when it is safe and legal to do so.