Local Road Management Manual 391 500 meters apart along the segment length • Quality of materials refers to the type; suitability and effectiveness of material present on the surface (% of ifnes, loose stones). • Crown Shape is determined to be the height of the center of the road above the edge of the road. • Roadside Drainage refers to the ability of water to drain away from the road Note: Appropriate Condition Score The chosen condition rating should relfect the predominant condition over the total segment length. 3.3.1. Gravel Thickness Assessed over total length of segment DEFINITION This component applies only to unsealed roads that are surfaced with an imported material i.e. gravel roads. If the road has not been surfaced with imported gravel then the road is an earth road and the gravel thickness is 0mm and rated with a condition score of 4. METHOD To determine the thickness closer inspection (exit vehicle) at regular representative intervals (500m) is necessary. This inspection may involve digging test holes in the pavement wheel path. The condition score is the number against the condition description which best describes the predominant condition of gravel thickness existing over the total segment length. If there are isolated areas that vary from the rest of the segment then these can be noted under “Raters Comments”. CONDITION SCORE 1 Suiffcient Gravel—Depth of gravel > 100mm 2 Isolated sub-grade exposure (< 25%) - Depth of gravel 50 > 100mm 3 Moderate Subgrade exposure (25-75%) - Depth of gravel 25 4 Extensive Subgrade exposure (>75%) - Depth of gravel 0 > 25mm