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When it opened in 1978, the tunnel was the southern end of State
Highway 2. Alterations at the Ngauranga SH1/SH2 interchange in 1984 connected SH1 to the motorway; although SH1 continued off the Aotea Quay offramp until 1996. In 1996 Transit extended the SH1 status to the entire route from the end of
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Some of the pillars for the second tunnel approaches are visible in the
Clifton Terrace car park adjacent to the cable car line, as is some of the approach road which currently forms part of the upper deck of the Clifton Terrace carpark. These pillars may also be seen on the left hand (eastern) side
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However this proposal was shelved in the early 1970s as the rising cost of building the single tunnel ruled out duplication for the foreseeable future and the extension beyond Willis Street. The cut in funding sees the design of the motorway abruptly reduce from about the Bowen Street overbridge as
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The tunnel was opened as part of the extension of the
Wellington Urban Motorway through Thorndon to Te Aro and was originally envisaged to include a parallel three-lane tunnel exclusively for southbound traffic (with the existing tunnel built for northbound traffic only). The motorway was intended
425:(NZTA) is upgrading the fire fighting, lighting, ventilation and drainage systems, building new tunnel control buildings and making some earthquake safety improvements. This work will extend the working life of the Terrace Tunnel. The upgrade finished in 2012.
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The tunnel is one of the few single-carriageway stretches of motorway in New
Zealand. All that separates opposing flows of traffic is a set of double no-overtaking lines and a series of slim fixed-in-place post-style road bollards.
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The corridor incorporating the tunnel is part of the wider study being undertaken by the NZTA. Future duplication of the tunnel is currently being investigated.
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six lanes are curtailed to three lanes. Appraisal of expected traffic flows also indicated that the second tunnel would not be needed for many years.
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has been proposed. Investigation as part of the tunnel link project raised questions about safety of such an option, but it has not been ruled out.
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The tunnel has three traffic lanes, one southbound and two northbound. The merge towards single southbound lane causes frequent
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As you enter the tunnel it is impossible to see the other end, as it curves in the middle.
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Upgrade works were being completed by the
Wellington Tunnels Alliance formed by
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In order to ensure that the tunnel continues to operate effectively the
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of "The
Terrace Looking South" webcam on the CityLink website.
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Transport buildings and structures in the
Wellington Region
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51:. Unsourced material may be challenged and removed.
468:Institution of Professional Engineers New Zealand
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544:Buildings and structures in Wellington City
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16:Motorway Tunnel In Wellington, New Zealand
111:Learn how and when to remove this message
493:Leighton Contractors takes to the roads
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374:which would also have been duplicated.
222:Three (two northbound, one southbound)
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49:adding citations to reliable sources
389:(tidal flow) system as used on the
569:1978 establishments in New Zealand
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405:the Wellington Urban Motorway to
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36:needs additional citations for
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554:State Highway 1 (New Zealand)
480:""The Terrace Looking South""
265:under The Terrace in central
516:New Zealand Transport Agency
511:"Terrace Tunnel duplication"
411:Wellington Inner City Bypass
409:. From 2007 this is via the
360:Wellington Inner City Bypass
195:New Zealand Transport Agency
186:New Zealand Transport Agency
549:Road tunnels in New Zealand
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417:Systems and safety upgrade
230:70 km/h (43 mph)
208:460 metres (1,510 ft)
564:Tunnels completed in 1978
260:Wellington Urban Motorway
162:Wellington Urban Motorway
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60:"Terrace Motorway Tunnel"
391:Auckland Harbour Bridge
240:26 ft (7.9 m)
124:Terrace Motorway Tunnel
248:42 ft (13 m)
372:Mount Victoria Tunnel
434:Sinclair Knight Merz
430:Leighton Contractors
400:State Highway status
354:during peak periods
330:41.2913°S 174.7718°E
297:41.2872°S 174.7717°E
45:improve this article
465:Engineering to 1990
423:NZ Transport Agency
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497:New Zealand Herald
407:Wellington Airport
370:to be extended to
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302:-41.2872; 174.7717
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43:Please help
38:verification
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482:. CityLink.
333: /
321:174°46′18″E
300: /
288:174°46′18″E
273:Coordinates
538:Categories
452:References
440:and NZTA.
352:congestion
318:41°17′29″S
285:41°17′14″S
267:Wellington
258:takes the
71:newspapers
356:rush hour
200:Technical
169:Operation
192:Operator
143:Location
138:Overview
101:May 2016
85:scholar
522:17 May
346:Design
205:Length
174:Opened
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438:Aecom
263:(SH1)
245:Width
218:lanes
182:Owner
154:Route
92:JSTOR
78:books
524:2016
254:The
177:1978
64:news
216:of
214:No.
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