{
  "endpoint": "/ai/road-signs/signs/W100.json",
  "canonical_url": "https://www.safetysignonline.co.za/ai/road-signs/signs/W100.json",
  "source_page": "https://www.safetysignonline.co.za/pages/road-signs-w100-series-json",
  {
  "schemaVersion": "sso-ai-road-signs-signs-w100-za-1.0",
  "endpoint": "/ai/road-signs/signs/W100.json",
  "language": "en-ZA",
  "jurisdiction": "South Africa (SADC-RTSM aligned)",
  "series": {
    "seriesId": "W100",
    "seriesName": "Road layout warning signs",
    "class": "Warning",
    "groupName": "ROAD LAYOUT",
    "seriesPurpose": "W100 series signs warn road users of changes in road layout or alignment that may require a reduction in speed or increased attention."
  },

  "authoritativeBasis": {
    "primarySources": [
      {
        "title": "SADC Road Traffic Signs Manual (RTSM) Volume 1 – Warning Signs",
        "scopeUsed": [
          "Definition and function of warning signs",
          "Classification of W100 road layout warning signs",
          "Colour and shape requirements for warning signs",
          "Use of advance warning and supplementary plates"
        ]
      },
      {
        "title": "SADC Road Traffic Signs Manual (RTSM) Volume 4 – Warning sign plates",
        "scopeUsed": [
          "W100 series identification",
          "Plate-based references for curves, bends, intersections, and lane changes"
        ]
      }
    ],
    "performanceStandards": {
      "included": false,
      "note": "Material performance, retroreflective class, and substrate requirements (e.g. SANS 1519) are excluded and will be introduced later."
    }
  },

  "designRules": {
    "shape": "Triangular (equilateral, point upwards)",
    "mandatoryColourSystem": {
      "permanent": {
        "background": "White",
        "symbol": "Black",
        "border": "Red",
        "finish": {
          "retroreflective": "Recommended for night-time visibility",
          "blackAreas": "Semi-matt where applicable"
        }
      },
      "temporary": {
        "background": "Yellow",
        "symbol": "Black",
        "border": "Red",
        "finish": {
          "retroreflective": "Required except for black areas",
          "blackAreas": "Semi-matt"
        }
      }
    },
    "generalNotes": [
      "Warning signs do not impose legal restrictions but indicate conditions requiring caution.",
      "The triangular shape with red border is reserved exclusively for warning signs."
    ]
  },

  "applicationRules": {
    "whenUsed": [
      "To warn of changes in horizontal or vertical road alignment",
      "To warn of intersections, junctions, or merging layouts",
      "To warn of narrowing, widening, or termination of roadways"
    ],
    "notUsedFor": [
      "Regulatory instructions (R-series)",
      "Mandatory movements or prohibitions",
      "Information or guidance messages"
    ],
    "advancePlacement": {
      "principle": "W100 signs are generally placed in advance of the hazard.",
      "distanceDetermination": [
        "Operating speed",
        "Severity of layout change",
        "Available sight distance"
      ],
      "referenceNote": "Exact advance distances are defined in RTSM tables and diagrams and are not enumerated here."
    }
  },

  "combinationRules": {
    "supplementaryPlates": {
      "allowed": true,
      "series": "W400 (supplementary warning plates)",
      "functions": [
        "Distance to hazard",
        "Extent of hazard",
        "Additional clarification of layout change"
      ]
    },
    "multipleWarnings": {
      "rule": "Where several hazards occur in close succession, combined or repeated signing may be used.",
      "priority": "The most severe or unexpected hazard should be emphasised."
    }
  },

  "signIndex": {
    "note": "W100 sign variants are primarily plate-defined. Only categories and text-confirmed examples are listed here.",
    "categories": [
      {
        "categoryId": "horizontal_alignment",
        "description": "Warnings relating to horizontal curvature or change in direction.",
        "examples": [
          "Single curve",
          "Reverse curve",
          "Series of curves"
        ]
      },
      {
        "categoryId": "vertical_alignment",
        "description": "Warnings relating to changes in vertical alignment.",
        "examples": [
          "Steep ascent",
          "Steep descent",
          "Crest"
        ]
      },
      {
        "categoryId": "junction_layout",
        "description": "Warnings of intersections and junction configurations.",
        "examples": [
          "Side road joining",
          "Crossroad",
          "T-junction"
        ]
      },
      {
        "categoryId": "lane_configuration",
        "description": "Warnings of changes in lane arrangement.",
        "examples": [
          "Road narrows",
          "Dual carriageway ends",
          "Additional lane ahead"
        ]
      }
    ]
  },

  "knownSeriesCharacteristics": {
    "anticipatoryFunction": "W100 signs allow drivers to anticipate layout changes and adjust speed or position.",
    "symbolicCommunication": "Symbols convey layout information without reliance on text.",
    "riskBasedUse": "Signs are used where the layout change is not immediately obvious."
  },

  "links": {
    "parentIndex": "/ai/road-signs.json",
    "seriesCatalogue": "/ai/road-signs/w-series.json",
    "relatedSeries": [
      "/ai/road-signs/signs/W200.json",
      "/ai/road-signs/signs/W300.json",
      "/ai/road-signs/placement.json",
      "/ai/road-signs/symbols.json"
    ]
  },

  "dataQuality": {
    "method": "Content is based strictly on RTSM textual definitions and general rules for W100 road layout warning signs.",
    "limitations": [
      "Individual sign codes (e.g. W101–W1xx) are not exhaustively listed due to plate-based representation.",
      "Exact pictograms, angles, and dimensions require visual extraction from Volume 4 plates."
    ],
    "plannedEnhancements": [
      "Populate full W100 sign code list after plate extraction.",
      "Add SANS 1519 performance requirements in a later revision."
    ]
  },

  "disclaimer": "This file provides a structured description of the W100 Road Layout Warning sign series based on supplied RTSM documents. Always consult the latest official RTSM manuals and road authority approvals before implementation."
}

}