I've just added the raised dual carriage way sections to our Terra-Block Terra-City One range.
Terra-City One: Sally 4ths Urban / Sci-Fi Terra-Block Range got a stack of new releases last week to enable raised dual carriage ways to be constructed above the urban sprawl. The new stuff includes 5cm x 10 cm pillar sections with three variations plus spreaders, 10cm x 10 cm pillar sections and spreaders and 200mm x 300mm carriageway sections. Using this system the road sections can be built from 5cm above ground level to any height you like.
Full details at:
http://wargamesbuildings.co.uk/Terra-Blocks/Terra-Block-with-Judge-Dredd-Miniatures-Game