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Project Description
Parsons prepared plans, specifications, estimates, and construction support services for the Central Artery/Tunnel (CA/T) Integrated Project Control System (IPCS). An underground tunnel system replaced the elevated structure of the north-south Central Artery (I-93) providing additional lanes in each direction and an extension of the Massachusetts Turnpike (I-90) connecting directly with Logan Airport.
The IPCS integrates all traffic surveillance and control systems (TSCS) with discrete device monitoring and control (e.g., drainage and ventilation). The TSCS requirements included detection of traffic incidents within one minute, real-time identification of traffic response plans, and coordination of surface street routes with the new alternative freeway routes.
The design uses a real-time system that combines supervisory control of facility functions, such as intrusion detection, access control, and fire detection with traffic surveillance and control functions. IPCS design systems include a primary and backup control center; facility controls; a communications subsystem; underground radio coverage for emergency agencies; telephone subsystem extensions; fire alarm subsystems; closed-circuit television (CCTV); video incident detection; traffic control strategies and response system; highway advisory radio; AM/FM rebroadcast radio; and all final project-wide traffic elements, including sign supports, fixed signing, pavement markings and markers, variable message signs, lane use signs, and variable speed limit signs.
The Operations Control Center design includes operator consoles configured as intelligent CRT workstations that serve as the primary interface between the CA/T control room operators and the IPCS. Communications between field devices and central control use a redundant fiber optic backbone system, based on SONET standards for audio and data transmissions. An extensive CCTV system using multiplexed camera signals on a separate fiber network provide for roadway monitoring.
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