World Longest Bridge = Silliest Too!

perhaps, you are talking of Hangzhou Bay Bridge. Wikipedia says "the bridge shortened the highway travel distance between Ningbo and Shanghai from 400 km (249 mi) to 280 km (174 mi) and reduced travel time from 4 to 2.5 hours." So, it is 36 km long and saves 120 km travel distance.
 
Quote from adadadog:

A new bridge in Qingdao, Shangdong.

http://www.bbc.co.uk/news/world-asia-pacific-13976281
Ah, yes.

http://www.telegraph.co.uk/news/worldnews/asia/china/8248197/China-builds-worlds-longest-bridge.html

people from other parts of China have denounced the huge cost of the bridge, especially as it only cuts the distance between Qingdao and Huangdao by 19 miles.

"To spend billions to save 20 minutes driving time is a waste of taxpayers money. It's just a show project to make the governor of Shandong look good," complained one commentator from Jilin Province in China's northeast.

China is already home to seven of the world's 10 longest bridges, including the world's lengthiest, the 102 mile Danyang-Kunshan rail bridge, which runs over land and water near Shanghai.
 
Billions/ (20 mintues x # of vehicles) x life of bridge in years = ?


In turn, minutes can also be translated into liters of fuel.
 
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