I guess I should add some pictures.

South Bay Interchange, connecting IB-95 to IB-295 in the South Bay district of Myers Bay. More detailed description on the project page.

Custom-built shields on the signage at the South Bay Interchange. I built a single background shield, and use a new map for each new numbered route. The only custom shield built for a state road is the MC 1 shield, present in this image.

Pickerville Viaduct, carrying IB-95 over local roads in Pickerville to connect Myers Bay to Ocean City.

The Riverside Interchange in River City, a standard cloverleaf connecting IB-40 with IB-140 (future IB-45).

The West Swampland Viaduct carrying IB-40 across the Central Wetlands, connecting Myers Bay with River City.
I will also have to renumber all of the east-west highways for the next update to reflect how much space I've chosen to fill for this map. IB-20 will be IB-10, IB-40 will be IB-20 (so I don't have to make a bunch of new signs.
Edit: the pictures should show up if you open them in a new tab