%0 Journal Article
%T Traffic control solutions : a light at the end
%J IMSA journal
%D 2002
%A Shaffer, R.
%V 40
%N 5
%P 49-53
%X 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.<p />
%G 
%I International Municipal Signal Association
%@ 1064-2560
%U http://dx.doi.org/