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Scheme Identification and Prioritisation

Implementing an effective Highway Asset Management Strategy relies upon robust systems for scheme identification and assessment. Increasingly highway authorities need to demonstrate that they are achieving value for money from the schemes that they carry out. The W.D.M. Limited Consultancy team has extensive experience of working with highway authorities in developing and improving scheme identification.

Often authorities have SCANNER, SCRIM® and Deflectograph data, visual condition data and other data sources that are used as part of scheme identification. Developing a prioritised list that considers all available data can be a complex task. WDM® has developed a number of tools and techniques to help authorities in developing scheme lists.

Scheme identification can either be undertaken using visual identification of potential schemes, or using an automated process through WDM® Scheme Manager Software. The WDM® Consultancy will assist authorities in identifying the best methodology for any authority.

For both methods the process is similar and is illustrated below.

Scheme identification process

A key element of the WDM® Consultancy approach is the analysis of data to assist an authority to identify schemes that meet specific policy objectives, for example to achieve the best effect on the National Indicators, the most effective schemes using weightings for different criteria, or the most cost effective schemes.

The schemes can be identified using mapping tools, or as scheme listings as illustrated.

Individual Scheme Summary

Scheme Name A_Class_ST_1
Location Reference A00, Sec 00 10, 0 to 500m
Length of Scheme 500m
% Functional 42%
% Structrual  58%
Scheme Type Structural
Scheme Effectiveness 60%
Scheme P-Factor 23
Scheme Cost £120,000
Pseudo BCR 737
% in Red RCI 15%
Effect on Performance Indicator 0.004%

Individual scheme summary

Typical scheme plan

Summary of proposed works

Scheme identification and prioritisation can be adapted to suit any authority’s specific requirements.

The WDM® Consultancy has undertaken a number of projects using condition data including:

  • Assessment of utility reinstatement work
  • Predicting roads likely to experience category 1 defects
  • Developing weighting sets for Unclassified roads
  • Review of the performance of aggregates in terms of SCRIM

* SCRIM is the registered trade mark of W.D.M. Limited

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