premise: The Fuling Yangtze River Bridge is a cable-stayed bridge over the Yangtze River in Fuling District of Chongqing, China. Completed in 1997, it was the first bridge over the Yangtze in the Fuling district. The bridge carries four lanes of the China National Highway 319 and is 631 m long including a main span of 330 m .
hypothesis: It was impossible to make it a five lane bridge.
reason: There's no reasoning to believe that this Bridge plan couldn't allow for more lanes.