Allow biggest bridge to go over 1 tile gap in terrain

The biggest bridge has the perfect gap, to over 1 dig tile, but it seems to try and place it self on the lowest level, hence the red squares.
Changing this would allow 6 pipes/belts in the hole and then 8+3+3 in the normal gap under the bridge. More if the bridge could be placed on retaining walls.

Managed to align the Ramp to the upper ground level but some random red tiles are preventing me from placing the ramp

All bridges should be able to do this. Even if the gap under the bridge is deeper than 1 unit in height.