[aMorePerfectUnion]

Perhaps it is terminology.

The original project consisted of two “lanes”.
The expansion adds a third lane/canal.

It is an amazing project. Just the amount of dirt moved was amazing to see.

[Cementjungle]

Indeed. And, here's the outline of the plan for the Nicaragua Canal that China plans to start building later this year:

http://hknd-group.com/upload/pdf/20150105/Nicaragua_Canal_Project_Description_EN.pdf