Interpreting road surface condition scores

Condition scores represent the condition of the road surface, and present the data on a scale from 0 to 100 %, A score of 100 % represents the best possible condition and 0 % the worst. However, every score has a defined set of distress and fix types that contribute to the final score calculation based on their respective deduct value curves. A deduct value curve, specific for every instance type within a score, determines the amount deducted from the score as a function of the extent value.

A condition score is calculated by subtracting the deduct values from the value 100 %.

For example, there are two kinds of distresses present on a 5 m road section: binder bleeding and potholes. The highest relative lateral extents of the binder bleeding and potholes on that 5 m section are 40 % and 10 %, respectively. For example, with respective deduct values of 20 % and 40 %, for this 5 m road section, the condition score is 100 % − (20 % + 40 %) = 40 %. However, depending on the score, further processing is done to the deduct values when calculating the final score.