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Data is increasingly important in underpinning the New Zealand transport sector’s approach to consistent levels of service, asset management and investment decision making.

The Road Efficiency Group (REG) is working hard to help the sector improve the quality of our transport related data to support effective evidence-based decision making and lift investor confidence.

The objectives

The objectives of the DQP are to:

  • establish a framework to measure, monitor and report data quality across Road Controlling Authorities (RCAs) over time
  • establish a data quality baseline for each RCA, establishing a national perspective of data quality across RCAs, different quality dimensions and data types
  • gain an evidence-based understanding of the root causes of the data quality issues
  • develop work programmes to address the issues and help RCAs improve data quality over time.

The approach

The DQP has been separated into three phases of focus as follows:

Phase 1: 2018/21 National Land Transport Programme (NLTP) One Network Road Classification (ONRC) and related performance measures (limited to RAMM data).

Phase 2: Road Asset Management and Decision Support Systems related data. Interrogation of RAMM data for network, asset inventory, maintenance activity and traffic demand. Plus, interrogation of RCA data from the NZTA Transport Investment Online (TIO) and RAMM to compare pavement and resurfacing renewal achievements vs as-built asset inventory.

Phase 3: Data required for the new ONRC performance measures for the 2021/24 NLTP and selected 2018–21 NLTP input measures.

Assessment philosophy

For 2017/18, a framework consisting of 63 metrics has been adopted to assess the national and each RCAs data quality.

The data quality of each RCA is assessed annually and reported in terms of ONRC and asset management. For each metric the RCAs result is compared against the distribution of all RCAs across New Zealand and the expected standard.

The metric framework developed interrogates the data that underpins the reported ONRC Performance Measure results and supports our decision-making processes. Each metric has been selected to test a cross-section of the data looking at data quality in terms of accuracy, completeness and timeliness.

The intent is for the results to flag potential issues with how the data is being collected, managed and maintained. Further analysis is required on those results not at the expected standard to determine what action (if any) is required. The focus of this should be at the root cause, rather than simply correcting the record.

View annual RCA data quality reports

Data quality framework example

Interrogate your RCAs data quality results in the ONRC PMRT

The ONRC and Asset Management data quality reports are also within the ONRC Performance Measures Reporting Tool (PMRT) and dashboard functionality has been added so RCAs can interrogate their data quality results through the dashboard.

RCAs can now learn more about the quality of their roading data, where it is excellent and where it can be improved.

Access the ONRC Performance Measures Reporting Tool (PMRT)(external link)

Asset Management and Decision Support System data quality (phase 2)