Development & Testing of the New Candidate Selection Algorithm - Project Report - Āpōpō

Version 1: June 2020

The Treatment Selection algorithm (Old CSA), sitting currently within RAMM, is a simple and easy to use tool that meets a number of needs for the road asset manager:

- At a treatment length level, it identifies a candidate list of renewal sites that can be taken for field validation to confirm the year 1 and 2 FWPs.
- At a network level it serves to identify network pavement and surfacing renewal needs for a two-year period.
- At a network level it provides a prioritised list based on first year rate of return, which can be used as a basis for managing limited funding.

The old CSA is used to forecast the timing and treatment required to maintain roads in good condition for the least whole-of-life cost in the short to medium term.

The old CSA was reviewed for NZTA in September 2016. (Report 599). The objective of this research was to improve the treatment selection algorithm.

Since the old CSA was developed in the 1980s:

- the long-term pave...