I really like this map, I really do, but I have 3 things to say/ask:
1. Is the ground supposed to be a little below the ground?
2. Have you thought of adding trees and/or grass?
3. The bridge controls don't show up in Options > Controls > Bindings menu.
Other than that, awesome job OR!
There is not much I can say because this map essentially is a proof of concept, and PoCs do not need high-quality textures or expansive road networks.
The true proof of concept (PoC) is the jBeamed bridge which can actually collapse.
I hope more map creators will slowly go and make new maps with bridges like these! Especially the developers need to convert their own maps as this should have been a feature for a while now, but I understand why they have not done this yet.