Pearl River Necklace, designed by NL Architects.

This proposed bridge has two objectives: to act as a “crossing facility” by connecting Hong Kong with mainland China and to solve the driving-on-the-right-side-of-the-road problem:

Hong Kong has traffic on the left where china has traffic on the right  In principle this has to be taken into consideration with the border crossing facilities.  Within the proposed master layout plan this leads to fairly unarticulated intersections.  It solves the switch, but does not communicate it ‘explicitly’.

The “flipper” aims to redirect traffic in an efficient safe way. Here’s the design under consideration:

[Via Designboom; Gizmodo]