Shared center lanes that are marked on each side by solid yellow and dashed yellow lines are reserved for _______ and can be used by vehicles traveling in either direction.

The correct answer indicates that shared center lanes, marked with solid yellow and dashed yellow lines, are primarily designated for making left turns. This lane configuration allows vehicles from both directions to utilize the center lane safely for the specific purpose of turning left, while the solid yellow lines signify that the lane should not be used for through traffic or passing other vehicles.

Understanding this is crucial for safe driving practices. The dashed yellow line indicates that vehicles moving into the center lane to make a left turn are allowed, whereas the solid yellow line signifies that the lane should not be crossed by others traveling straight. Therefore, using this lane appropriately for left turns helps facilitate smoother traffic flow and enhances safety at intersections.

In contrast, using the lane for merging into traffic, stopping for emergencies, or passing other vehicles does not align with the intended purpose of these shared center lanes, as it could lead to confusion and potential accidents.