specialisation of LINE for flexible service; as all the service on a LINE may not all be flexible, flexibility itself is described at JOURNEY PATTERN level (meaning that a separate JOURNEY PATTERN is needed for each type of flexibility available for the line).

Types of flexible services are: Virtual line service; Flexible service with main route; Corridor service; Fixed stop area-wide flexible service; Free area-wide flexible service; Mixed types of flexible service; Mixed type of flexible and regular services