The contract for the Jack Lynch Tunnel in Cork included for the supply, installation and commissioning of a number of traffic related aspects of same, namely;

Barriers: A vehicle access control barrier was supplied and installed at the south portal to control access to the run off for over-height vehicles. Control of same is through the tunnel management system which also includes alarms for instances of power loss and boom movement failure.

Over-height Detection System: A system comprising a 3 way detection configuration placed at the entry to each portal and providing a signal on the detection of vehicles higher than that prescribed by the client. The system also included integral self checking for faults. Detection of an over-height vehicle automatically flags an alarm on the tunnel management system and also activates a variable message sign (VMS) which alerts the driver to the potential hazard.

Public Lighting: Supply and installation of the public lighting on the approach roads to the tunnel which consisted of a range of columns from 5 metre to 12 metre (both rooted and flanged), fitted with 150 and 250 watt SON-T lanterns. 

Vehicle Hazard Detection System: Design and Development of an Incident Management System comprising 8 induction loop based outstations at 100 metre intervals, each with the ability to monitor speed, direction, occupancy and headway and offering instantaneous communication with the IMS central controller which has a direct link to the SCADA system in the Tunnel Management Building.

The system is based on three modes of operation; light, medium and heavy occupancy and automatically changes to the most applicable mode based on analysis of the data gathered. It offers real time monitoring and reporting in all modes of;

• Stationary Vehicles within the tunnel 
• Vehicles travelling excessively fast or slow 
• Vehicles travelling reverse direction to nominated vehicle flow 
• Volume, occupancy and statistical data

All modes and detection characteristics are configurable by the tunnel management staff and data can be viewed either centrally at the IMS controller / SCADA system or locally at each outstation through interrogation of the data collected using a laptop.