Annex 2C: ROCOND 349 Figure 2.3 Distress Types Rating Method 2.3.1. Measurement Over 50m Gauging Length As mentioned in section 0, the 50m gauging length for both flexible and rigid pavements is to be located between 0m and 50m from the start of the segment (in the direction of increasing chainage). The position of the gauging length can be moved from 0m if this occurs on a bridge, in an intersection, there is maintenance work in progress or if there are other factors influencing the ability to perform the gauging length survey. Where possible the position of the gauging length should remain the same every year, if the gauging length is not positioned at