Local Road Management Manual 350 the start of the segment then the gauging length location must be recorded in the comments field. The reason that the same gauging length should be used every year is for comparison of the road condition from one year to the next. 2.3.1.1. Flexible Pavements For flexible pavements, rutting is measured only in the gauging length. (Refer to section 3.1.) Figure 2.4 Two Lane Rural Road Gauging Length On multilane rural roads, (flexible pavements) only the outer two lanes are rated for rutting. The inner lanes can be used in cases where the road has been widened and the inner lanes have many more defects than the outer lanes. Figure 2.5 Four Lane Rural Road Gauging Length