Before any parking lot or roadway is open to traffic, all necessary pavement markings must be in place, clearly visible and in accordance with local regulations. Pavement line markings, which are no longer applicable, should be removed immediately to avoid possible confusion to the users.
Pavement markings have limitations. They may be covered by snow, may not be clearly visible when wet, or may not be durable when subjected to heavy traffic. In spite of these limitations, they have the advantage of conveying warnings or information to drivers without diverting their attention from the roadway.