Technical Booklet N Drainage·Page 14·2.10
Rodding points for branch pipe access
Rodding points must be provided to allow clearing of blockages in any section of branch pipe that cannot be accessed by removing a trap.
Rodding points should be provided to give access to any length of branch pipe which cannot be reached by removing a trap.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet N - Drainage.pdf