Delivering a safe road system
One of the key elements in the development of a safe road system within a fixed budget is the use of:
- An objective assessment of road condition;
- A validated and objective method of prioritising different types of defects;
- A validated treatment selection procedure;
- A validated and objective scheme selection and prioritisation process; and,
- An assessment of the financial implications of the programme of work in terms of the asset value.
Many authorities now use the survey services of W.D.M. Limited together with the Company’s software to deliver a safe road system. Typically, Deflectograph, SCANNER and SCRIM® surveys are used to define network condition. The measurements then use the WDM® Pavement Management System to hold the data and provide the ability to display and report condition and changes from year to year. The Scheme Manager module can be used to identify schemes, including schemes resulting from SCRIM measurements and accident data alone. The Whole Life Cost Module allows the Asset Value and annual depreciation to be determined.
The outputs are used by highway staff to brief members and to demonstrate to them the consequences of different budgets. The result is a clear maintenance investment programme that can easily be updated as new condition survey data becomes available.
Many authorities use this approach and some have developed their own criteria for selection and calculating backlog using the standard software. A typical example was reported at the 2014 Saferroads Conference.
* SCRIM is the registered trade mark of W.D.M. Limited