The Road Condition Indicator (RCI) was developed as a tool to make it easier for engineers to make sense of the vast quantity of data provided by the machine-based, traffic-speed SCANNER surveys. The development of the RCI was a challenging task, due to the multiple and disparate requirements of those who make use of it – the RCI was to be used as a national indicator of pavement network, a local indicator of pavement network condition to enable comparisons between different authorities, a local indicator to identify areas which are in a generally worse or better condition than others and a way of helping those responsible for maintenance planning decisions actually decide and prioritise their maintenance programmes.
The “one size fits all” approach of the RCI means that it is not ideally suited as a means of actually planning and prioritising maintenance. This has lead to a call from engineers to produce a range of complementary indicators which provide more useful guidance about whether a site requires further investigation or maintenance, and what type of maintenance this should be.
A method has been developed which calculates five intermediate indicators for the pavement, using information already collected by the SRMCS. These intermediate indicators have been designed to reflect the key types of deterioration which the SRMCS surveys can detect. The most appropriate parameters for inclusion in each intermediate indicator, and thresholds for use with the parameters, have been proposed. A method for combining these intermediate indicators to produce three Maintenance Condition Indicators has been proposed.
Additionally, the research looked at a number of possible alternative approaches for displaying and visualising the data. Some of the approaches to displaying multiple indicator parameters, notably the symbolic displays, and the combination of symbols and colours, look promising and worthy of further investigation.

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