Working on the road bridge to backdrop transition again today.
The left section of the road bridge tapers from the right to left. To accomplish a smooth join I scribed the level height of the bridge into the backdrop and carved a groove into the drywall backdrop for the 1.5mm styrene sheet to sit in.
I then glued the overpass concrete railing to existing section, and the section of styrene sheet roadbed. Once this had dried, I then glued the styrene I beams into place under the roadbed.
Again, once the tractor trailers are placed into position it hides the translation further & blocks the viewable edge of the backdrop too.