A storage element and storage apparatus are provided. A wait state management unit allocates into a queue the reception number sent from a call connection by telephone, holds the call connection and notifies the client, for display, of a current wait state and wait time points increased as a wait time elapses, until a support client becomes available for response. There are first and second opposite terminations overlaying the metal strip. The system includes sharing average speed data calculated as well average speed data received from the plurality of vehicles to other vehicles, thereby enhancing the real-time communication of road condition data. In another embodiment, a small amount of cavitation is acceptable if the cavitation is below a threshold in which shock waves occur. The process allows control of the isobutene concentration entering the isoprene reaction zone to be at least about 40% consistently.