Editing Ramp meter (section)

== Ramp metering elsewhere ==

=== Japan ===
Ramp metering is being installed in Japan in the next few years{{when|date=April 2022}} to keep the flow of traffic moving in Japan. There are plans to install ramp meters on every on-ramp in the Japan motorway system.{{Citation needed|date=November 2021}}

=== Australia ===
{{Unreferenced section|date=March 2016}}
The largest ramp metering network in the country is in [[Melbourne]] (managed and controlled through [[VicRoads]]) on the [[Eastern Freeway, Melbourne|Eastern Freeway]] and most of all, on the entire inner-city M1 route which includes the [[Monash Freeway]], the [[CityLink]] [[Tollway]], the [[West Gate Freeway]] and the metropolitan section (south of the beginning of the [[Monash Freeway]]) for the [[Princes Freeway]]. There are also various ramp meters on the inner-city section of the [[Calder Freeway]]. [[Brisbane]]'s [[Pacific Motorway (Brisbane–Brunswick Heads)|Pacific Motorway]] and [[Bruce Highway]] (S/Bound Caboolture - Gateway Mwy) also uses ramp metering on some on-ramps, as does the northbound on-ramps of [[Perth]]'s [[Kwinana Freeway]] between [[Roe Highway|Roe]] and [[Canning Highway]]s. On most motorways, ramp metering is activated when sensors indicate that traffic is heavy, however, some motorways without sensors use time-based activation.

The 2010 M1 Upgrade in Melbourne installed 62 ramp meters that are coordinated using the HERO suite of algorithms developed by Markos Papageorgiou and Associates from the [[Technical University of Crete]]. The system was built on the [[STREAMS Integrated Intelligent Transport System|STREAMS]] platform and utilises the state-of-the-art ITS architecture. All the ramps can be linked when required to resolve motorway bottlenecks before they emerge.  The results of a trial improved capacity by 9% over the previous fixed-time ramp-metering system, average speeds increased by 20&nbsp;km/h (12 MPH) and traffic throughput at bottleneck locations can be reliably maintained around 2200&nbsp;PCE per lane.  The HERO system takes real time data every 20 seconds from the motorway, ramps and arterial road in order determine the best signal timing for the next 20 seconds. The data detection system comprises Sensys detectors in every freeway lane at 500&nbsp;m (1,640 feet ) spacings with a minimum detectors at three locations on each ramp including the freeway entrance with the arterial road.  The system also manages the arterial road interface with the freeway, balances ramp queues and delays across ramps, and is capable of managing bottlenecks 3–4&nbsp;km (1.8 - 2.4 mi) downstream of a ramp entrance.  The system is also supplemented by real-time travel-time information to key destinations and incident and congestion information displayed on specially designed full-colour VMS on the approaches to the freeway entrance ramps.  This information provides sufficient advice for motorists to determine whether or not to use the freeway during incidents etc. The system also provides dynamic ramp closure in the event of a major incident.

Ramp metering was introduced on the Rozelle Interchange in Sydney in 2024 to alleviate congestion for Victoria Rd users, after lengthy delays and back-ups through Drummoyne and Rozelle and onto the Anzac Bridge.<ref>{{Cite web|url=https://www.transport.nsw.gov.au/projects/current-projects/rozelle-interchange |title=Rozelle Interchange connects the M4 to the Anzac Bridge and the M8 to City West Link and Victoria Road |website=Transport for NSW |date=15 February 2024 |access-date=2024-07-16}}</ref>

=== 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.

=== South Africa ===
Ramp meters were, for a while, installed on the Samrand South bound, Old Johannesburg South bound and on New Road North and South bound interchanges on the N1 [[Ben Schoeman highway]]. The ramp metering was part of the Intelligent Transport System launched in October 2007 to aid traffic flow between [[Johannesburg]] and [[Pretoria]].

A ramp meter has also been installed on the northbound on-ramp from Blue Lagoon to the M4 Highway in Durban since early 2007.

=== Taiwan ===
Freeways in Taiwan use ramp meters during peak hours since 1993.<ref>{{in lang|zh}} Taiwan Area National Freeway Bureau: [http://www.freeway.gov.tw/Publish.aspx?cnid=586 History of national freeways]</ref> [[Traffic enforcement camera]]s are deployed to deter running the red lights, but a [[bus lane]] at Taipei Interchange from northbound Chongqing North Road to southbound [[National Highway No. 1 (Taiwan)|National Highway No. 1]] in northern [[Datong District, Taipei]] allows buses and properly indicated emergency vehicles to bypass the traffic control imposed by the ramp meters.<ref>{{in lang|zh}}Taiwan Area National Freeway Bureau: [http://www.freeway.gov.tw/Publish.aspx?cnid=87&p=78 Traffic Control:Ramp Metering]</ref>

=== Turkey ===
In 2016, two ramp meters were installed on a major highway in [[Istanbul]].<ref>{{cite web |url=http://tkm.ibb.gov.tr/kurumsal/haberler-ve-duyurular/katilim-kontrolu-uygulamasi |title=TKM Web Site 2017 |website=tkm.ibb.gov.tr |url-status=dead |archive-url=https://web.archive.org/web/20170618130630/http://tkm.ibb.gov.tr/kurumsal/haberler-ve-duyurular/katilim-kontrolu-uygulamasi |archive-date=2017-06-18}} </ref> It has been noted that there is a 10% improvement in traffic provement along with 20% decrease in delays.{{citation needed|date=January 2017}}