Dear Sir,
Thanks for your visiting to Top China Travel. Here is Peggy to discuss your question about Hangzhou Bay Bridge’s length.
After our checking on the wikipedia (http://en.wikipedia.org/wiki/Hangzhou_Bay_Bridge ) and Chinese researching engine Baidu (http://baike.baidu.com/view/21028.htm ), the articles show that the length of this bridge is 36 km actually. And I could not find materials say about “46.5 km” of Hangzhou Bay Bridge. Sorry to provide you a unclear answer.
Thanks for your mail again and welcome to contact us if you have any question or comment on our website@
Best regards
Peggy
Top China Travel