Local Road Management Manual 356 – e.g., chalk) Raters should purchase or manufacture all equipment. No supplies will be available from Central Office. Dimensioned drawings to assist in making the straight edge, measuring wedge and crack width scale are shown in section 5. During the survey, some items in the rating segment are examined in detail at representative two lane 50 m gauging lengths. On these occasions or when the vehicle is stopped for quick inspections, the rating vehicle should be moved to the side so that wherever possible, there is no obstruction to traffic. Safety equipment for traffic guidance should include: Safety vests for personnel Traffic guidance cones Appropriate Advance Warning Signs Note: A traffic controller may be required in some sections where there is difficult alignment or high traffic volumes Note: Representative 50 Meter Gauging Length On a rural road, a two-lane 50-meter gauging length is selected to rate the flexible item ‘Rutting’. All other items are assessed over the segment’s total carriageway area.