Resinfx have released 28mm Junk Barricades sets.
From their announcement:
Each set consists of two barricade terrain pieces.
The first set includes two straight barricade pieces.
Their sizes are aprox 6″ x 1.5″ inches.
The second set includes two corner pieces.
Their sizes are aprox 7″(corner) x 1.5″ inches.
These barricades are ideal for 28mm miniatures and are very detailed.