Dublin Tunnel Case Study - Electro Automation Group Limited

The Dublin Tunnel is the longest urban tunnel in Europe and its construction
was the largest civil engineering project in Ireland. The tunnel
is 4.5km long and has dramatically reduced the amount of HGV’s in
Dublin City Centre by diverting trucks arriving in Dublin Port through the
tunnel and straight onto the M50 motorway network.
ITS Road Services, a joint venture company between Egis Road and Tunnel Operation and
Electro Automation, was awarded a contract for the provision of speed monitoring system in the
Dublin Tunnel which allows the client to monitor driver behaviour in a confined space.
The scope of works included the supply, installation, testing and commissioning of Automatic
Number Plate Recognition (ANPR) cameras with onwards transmission to Variable Messaging
Signs (VMS) which displays the licence plate number of the offending vehicle. In order to minismise
disruption to traffic the installation was completed at night.
Three ANPR cameras and two VMS signs were installed in each lane, with the VMS units
downstream of the cameras at the appropriate distance.
The first two cameras are 200m apart in order to calculate the point speed of the vehicle between
the two points. The third and last camera in the bore will calculate time over distance—
speed from cameras one to three.
Journey Time Analysis software calculated the speed of the vehicle and if the vehicle is over
the threshold speed, the camera sends the licence plate number to the VMS; where it is displayed.
The ANPR camera also transmits data to the in-station.