The present invention provides a tunnel gateway device used for: receiving a domain name system server address for an inner layer or outer layer service of a tunnel configured by an automatic control server according to a management protocol; and taking its own address as the DNS server’s address and sending the address to a client, or sending the configured DNS server address to the client. The pressure sensor and transceiver are provided on a wheel of a vehicle, while the transmitter, receiver, and determining device are provided on the body of the vehicle. The surface of incidence of the resin lens has a spherical surface with a negative power, and the exit surface of this resin lens has a cylindircal surface with a negative power only in the sub scanning direction. A vacuum formed between adjacent faces of the TOC and THC urges the facing planar surfaces into thermal contact with one another. A preferred embodiment avoids deleting objects that may have been created by old software versions or persistent objects or objects that are likely to be transiently unusable.