Abstract: A communication-based navigation system that detects a traffic volume change and searches for a route. The system comprises terminal retaining geographic information and generating a route request and a traffic condition check request; traffic analysis server having at least one database corresponding to and in communication with the terminal; and service server receiving route request from the terminal for searching for route and transmitting searched route to the terminal and traffic analysis server, and relaying the traffic condition check request from the terminal to traffic analysis server. Traffic analysis server stores in database the searched route from service server and traffic conditions in the searched route and is responsive to the traffic condition check request signal for detecting traffic condition change from comparing a current traffic condition in the searched route with a previous traffic condition stored in the database and for transmitting the traffic condition change.

Abstract: The present disclosure provides an accident alert system for preventing secondary collisions. The system for preventing a secondary accident comprises a terminal configured to have a global positioning system (GPS) navigation capability, monitor and display a driving state and an accident state of a vehicle, transmit information on a driving state and the accident state via a communication network, and display information received on a screen; and a server platform configured to exchange information with the terminal, include an algorithm for determining the occurrence of an accident based on the information on the driving state and the accident state received from the terminal and traffic information, and inform other terminals of the occurrence of the accident.

Abstract: A communication-based navigation system that detects a traffic volume change and searches for a route. The system comprises terminal retaining geographic information and generating a route request and a traffic condition check request; traffic analysis server having at least one database corresponding to and in communication with the terminal; and service server receiving route request from the terminal for searching for route and transmitting searched route to the terminal and traffic analysis server, and relaying the traffic condition check request from the terminal to traffic analysis server. Traffic analysis server stores in database the searched route from service server and traffic conditions in the searched route and is responsive to the traffic condition check request signal for detecting traffic condition change from comparing a current traffic condition in the searched route with a previous traffic condition stored in the database and for transmitting the traffic condition change.

Abstract: The present disclosure provides an accident alert system for preventing secondary collisions. The system for preventing a secondary accident comprises a terminal configured to have a global positioning system (GPS) navigation capability, monitor and display a driving state and an accident state of a vehicle, transmit information on a driving state and the accident state via a communication network, and display information received on a screen; and a server platform configured to exchange information with the terminal, include an algorithm for determining the occurrence of an accident based on the information on the driving state and the accident state e received from the terminal and traffic information, and inform other terminals of the occurrence of the accident.