Outer Ring Tunnel

The Outer Ring tunnel, also known as the Taihe Road Tunnel, is a highway tunnel under the Huangpu River in Shanghai. The tunnel serves as part of the S20 Expressway and was completed on June 21, 2023. The tunnel runs east to west from Baoshan District to Sancha Port after crossing the Huangpu. The tunnel is 2,880 metres (9,450 ft) long and features 8 lanes with a speed limit of 80 km/h, which made it the longest underwater tunnel in Asia and third worldwide by length.^[1]

Key Information

Outer Ring Tunnel
Interactive map of Outer Ring Tunnel
Overview
Start	Baoshan District
End	Sancha Port
Operation
Opened	June 21, 2003 (2003-06-21)
Technical
Length	2880 km
Operating speed	80 km/h
Show more

The tunnel has been closed for 12 months due to construction since March 22, 2024.^[2]

1. ^ "上海外环隧道通车" (in Chinese). xinhuanet.com. 2003-06-22. Archived from the original on 2004-12-13. Retrieved 2009-07-16.
2. ^ "上海S20外环隧道将大修：3月22日起全封闭施工，计划工期12个月". 澎湃新闻 (in Chinese). 2024-03-14. Retrieved 2024-03-14.

31°22′44″N 121°30′00″E / 31.3788°N 121.4999°E / 31.3788; 121.4999

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