Editing Ramp meter (section)

=== New Zealand ===
[[Image:North Western to Northern On.jpg|thumb|Ramp metering on [[Northwestern Motorway|North Western]] to [[Auckland Northern Motorway|Northern]] connection in [[Auckland]].]]
[[Auckland]] has currently 91 ramp meters across the Southern, South Western, Northern and North Western motorways making it the largest [[Southern Hemisphere]] ramp metering system.<ref name="AO2014">{{cite book |doi=10.1109/ITSC.2014.6958028 |chapter=SCATS Ramp Metering: Strategies, arterial integration and results |title=17th International IEEE Conference on Intelligent Transportation Systems (ITSC) |date=2014 |last1=Aydos |first1=J. Carlos |last2=O'Brien |first2=Andrew |pages=2194–2201 |isbn=978-1-4799-6078-1 |s2cid=14985214 }}</ref> Ramp metering was installed Auckland-wide after a successful trial on Mahunga Drive in 2004,<ref>Brown T. et al. [https://web.archive.org/web/20110508135808/http://www.ipenz.org.nz/ipenztg/papers/2005/08_Brown_Clark_Evans_Wee.pdf New Zealand’s Easy Merge Ramp Signal  (Ramp Metering) Trial]</ref> before the [[Mangere Bridge (bridges)|Mangere Bridge]].

Traffic data collected from 25 ramp metering sites in 2007 (before ramp metering deployment) and 2009 (after) shows an average 25% improvement in both congestion duration and traffic speed as well as an 8% increase in traffic throughput. The data also shows an average reduction in crashes of 22%.<ref name="AO2014"/> This performance and safety data translates into estimated benefits of US$1.6M per ramp metering site per year.

The system controlling the ramps promotes the traditional coordination among on-ramps as well as real-time integration with traffic signals on the adjacent arterial network allowing the whole road network to be managed as a single integrated network.<ref>Aydos J.C. et al. ''[http://trid.trb.org/view.aspx?id=1279859 A Study on Integrated SCATS Intersection and Ramp Metering Control]'', Proceedings of the 19th ITS World Congress, Vienna, 2012</ref> For example, when motorway incidents adversely impact the adjacent arterial roads, an automatic response to the arterial traffic signals can be triggered to mitigate the impacts of the incident and vice versa. Recurrent and excessive traffic queues at on-ramp and off-ramp can also be managed in an integrated way in real-time. This integrated management is possible in Auckland because the same adaptive [[SCATS]] system controls both arterial traffic lights and motorway ramp meters.

The term ''Ramp Signalling''<ref>[http://www.nzta.govt.nz/network/projects/ramp-signalling/ Ramp Signalling] {{webarchive|url=https://web.archive.org/web/20141029014834/http://www.nzta.govt.nz/network/projects/ramp-signalling/ |date=2014-10-29 }}</ref> rather than ''Ramp Metering'' is purposefully adopted in New Zealand as a user-oriented name.