[REQUEST] Australian Standard AS 1597 Precast reinforced concrete box culverts

[whysx]

AS 1597.1 Part 1: Small culverts (not exceeding 1200 mm span and 1200 mm height)
AS 1597.2 Part 2: Large culverts (from 1500 mm span and up to and including 4200 mm span and 4200 mm height)