Emergency call arrangement for major roads and motorways has emergency telephones with transmitter and receiver units to receive data by radio from vehicle before passing data to traffic monitoring center

摘要

The emergency call arrangement has emergency telephones on major roads and motorways. Each emergency telephone (10) has a transmitter unit (11) and a receiver unit (12) and can receive data by radio from a transmitter in a vehicle (20), for passing on to a further receiver in a traffic monitoring center.