Canal Way Cycle Route Project Dubliners get on their bikes
The Canal Way cycle route is an ambitious plan to provide an off road, mainly segregated 2 way Cycle Route, along the two canals which encircle the centre of Dublin. The Royal Canal on the Northside of the Liffey and the Grand Canal on the South with the link between the two being the iconic Samuel Beckett Bridge.
3.6 km of phase 1 of the project was opened in 2012 with phases 2 and 3 now moving from design to Construction over 2014. These canals stretches a combined distance of 275kms from Dublin through the midlands of Ireland to the Shannon river, and some cycle routes have already been provided along the length of the canals with more in design.
The requirements to treat the route as a separate traffic route along its length and not share its facilities with any existing traffic signals upgraded with separate bicycle detection at each junction. As a sign of this, no cyclist buttons are used along its length. Instead loop detection and stop-line Video detection are used. Each junction was equipped with dedicated Bicycle detection at traffic signals, separate phases for bicycles with 100 mm cycle heads and with a new type of signalling to resolve Bicycle and Pedestrian Interaction at traffic signals along the route. At each junction, CCTV was to be provided, to allow traffic management, as well as to provide an element of security. All DCC Traffic cameras are shared in real time with the Irish Police.
Along much of the route the Canal Way is located on the canal side, which required the provision of a boardwalk cantilevered over part of the canal to avoid cycle/pedestrian shared space.
At each crossing point, the cycle way was provided with dedicated 100 mm signals and in many cases, due to space constraints, the primary signal for the adjacent traffic lane was mounted on a Cantilever pole in addition to highlight the separate nature of the route Stainless steel Traffic Signal poles were used for the Cycle track arms of the junction only.
Dublin uses the Australian SCATS Adaptive traffic control system on dedicated fibre optic network around the City with multiple separate rings radiating from the Traffic Control Centre in the City Centre. In total in phase 1, 22 Junctions or Pedestrian Controllers were connected to this fibre network along with 16 Cameras.
Most of the 240 Traffic cameras which DCC Traffic use are analogue with multiple Fibre optic networks providing the main communication network for both CCTV and Traffic Controller Communications. At the Traffic centre the CCTV signals are split with one input going into an analogue matrix and the other being converted into an IP stream for the Secondary Digital IP matrix. This provides maximum flexibility for distribution while ensuring that the CCTV images are available at the in-station without any compression loss and simplifying network security issues by not providing IP access points at the field equipment.
The solution chosen was the AMG 3700 series, configured in an 8 channel drop and insert configuration over a single Fibre providing 8 insert points along the route and providing a single CCTV input, plus a bidirectional data channel configured for RS232.
The RS232 is connected directly to the Traffic controllers on the SCATS AUTC system and at the in-station, this allows connection to the SCATS Hardware via DIGI C/Con 16 multi-channel serial adaptors. Because the system provides a point-to-point channel at each location, the in-station provides 8 separate bidirectional channels with RS 232 interfaces. Enabling the Traffic controller and the CCTV to be brought back on the same system, maximises its effectiveness. In addition, a 100 Mbits Ethernet connection is available at each node for future use. The 3700 also provides a CWDM transmission solution which allows up to 72 analogue cameras to be collected onto a single fibre. The dual redundancy means that in case of a fibre failure or node failure, the system will immediately re-route and maintain operation. The Network Management system reports fibre failures and node failures immediate via SNMP directly into the DCC Fault Management System.
The 3700 series provides zero control latency and uncompressed digital transmission thus ensuring the image received at the Traffic Control centre can be used for multiple applications including video analysis.
Three 8 Channel 3700 receivers were used at DCC Traffic Centre, with provision for more to be added as required, and only three fibre cores of the fibre laid along the length of the cycle route was utilised to provide connectivity for up to 24 Cameras and 24 (or 48 ) Traffic Controllers depending on board type.