A motel is the subject of an appraisal and it is determined that a rerouting of a county highway has limited customer access to the motel. This is an example of

Regression describes a situation where a property decreases in value due to the surrounding properties being less desirable or of lower quality. While the motel's value may be affected by surrounding conditions, the primary issue here is external access, not the quality of neighboring properties. Thus, regression does not apply in this context.

Functional obsolescence refers to a reduction in property value due to outdated features or inefficiencies within the property itself. Since the issue at hand arises from external changes rather than the motel's internal characteristics, this choice is not relevant to the scenario presented.

Landlocked property refers to a parcel of land that lacks direct access to public roads or waterways. While limited customer access may suggest a similar situation, it does not accurately define the motel's condition if the property still has some access, albeit reduced. Therefore, this choice is not applicable.