Citation

Shaffer R. IMSA J. 2002; 40(5): 49-53.

Copyright

(Copyright © 2002, International Municipal Signal Association)

DOI

unavailable

PMID

unavailable

Abstract

This article presents a history of traffic controllers, starting with the first device operated in 1868 in London, through today's intelligent transportation systems and applying them to tunnel conditions. Incident management is a key job, but many tunnels suffer from aging infrastructure, which includes legacy computer systems with faulty functionality. An innovative system for the Monitor-Merrimac Bridge Tunnel is described. Fault tolerance solutions are necessary to provide backups and continuous operation. The article explains other techniques for dealing with legacy equipment and promising future advances.