The first picture is of the Shatoujiaou Port right west of Dameisha on the Hong Kong side. There is a border crossing into Hong Kong right there which is now my preferred route of going to Hong Kong. (Yes, I will go there tonight). The other way – through Lo Wu train station in Shenzhen – could make one end up in a big-city traffic snarl-up, especially on a Friday night.
The second picture is of one of the dozen or so tunnels dotting the road between Shenzhen and Dameisha. None of the tunnels are very long and it seems preference was given to keeping the road straight and flat, instead of making it curve around the hills on the coastline.