A functioning bascule bridge (drawbridge) mod for BeamNG.drive!
This is my first time submitting a mod to the repository but all the credit for the creation of the bridge goes to Occam's Razer as I commissioned (paid) him to have this made.
In addition, a big thanks to Scruffy517 who did a lot of work on the included Gibson Strait testing map and was very patient and helpful while we worked together on finalizing it.
I encourage you to check out the links to some of their other works below. I also look forward to perhaps working with and supporting other mod creators in the future 
A video from my YouTube channel showing it "in action":
https://www.youtube.com/watch?v=fVPQHeu1BM8
Bascule Bridge Overview/Getting Started The first, and most important, part of the mod is the bascule bridge itself. After installing it, you will be able to spawn it in like any other vehicle from the Vehicle Selector (Ctrl+E).
There are two variants, the 'single leaf' and 'double leaf'. Double leaf has two sides (embankments) that will open simultaneously while single leaf only has one side that will open and is therefore shorter.
If spawning it into an existing map, you can use the World Editor (F11) to position it in the map. Please note that there are some mechanics underneath the ends of the bridge so it's recommended that you pull back some terrain in the World Editor to keep this area clear. Otherwise, the bridge may not function properly.
Please see the below screenshots and additional resources section for some recommended maps that you can use it on.
Controls
Lift Up/Down (toggle): Space Lift Up: Page Up Lower Down*: Page Down*
Tuning
There are some tuning options available to you in the Vehicle Customization (Ctrl+W) menu, including:
Lift Amount: The angle in degrees of how high the bridge opens (max. 45 degrees) Lift Speed: The speed at which the bridge open when toggled (in %, can go up to 150%) Paint: the bridge supports and rails are colour-able using the color tab.
Gibson Strait (Bridge Testing Map) The second part of this mod is a small bridge test map to try out the bridges on*.* This is ideal if you just want to try the bridges without needing to spawn them in and place them on an existing map. The bridges will come "pre-spawned" when you load into the map. Simply tab over to them (change vehicle) to access their controls. Check out some screenshots of the map below.
Additional Resources Video tutorial on how to use & place the bridge on existing maps:
https://www.youtube.com/watch?v=qoinn9Js7Ug
The maps pictured in the screenshots above that I used to place the bridge on are: Italy Jungle Rock Island BeamNG Map Rally-Monster-Funpark (Beta - New Big BeamNG Map Rally-Monster-Funpark | BeamNG) Roane County, Tennessee, USA (Roane County, Tennessee, USA | BeamNG)
Please also check out Occam's Razer and Scruffy517's other work below. They were instrumental in helping to make this project happen!
Occam's Razzer: Resources from Occam's Razer | BeamNG Scruffy517: Resources from Scruffy517 | BeamNG
And thanks to all on my Discord server for their assistance with testing!