Choosing assets for improvement
Each year we survey a percentage of the highway network to measure its condition. The surveys assess the highway surface condition against a range of criteria and the results can be visualised as a RAG (Red, Amber, Green) map; the surveys do not measure structural condition but makes assumptions of it based upon the failures measured on the surface. The surveys output a measure of road condition over sections of a road which we report to DFT as RCI (Road Condition Index) scores, these also are the scores against which we are measured for performance.
We also survey the highest risk area of the network for skid resistance. We assess the results against investigatory levels and make improvements to road grip to increase safety where appropriate.