{
  "endpoint": "/ai/road-signs/signs/R500.json",
  "canonical_url": "https://www.safetysignonline.co.za/ai/road-signs/signs/R500.json",
  "source_page": "https://www.safetysignonline.co.za/pages/road-signs-r500-series-json",
  {
  "schemaVersion": "sso-ai-road-signs-signs-r500-za-1.0",
  "endpoint": "/ai/road-signs/signs/R500.json",
  "language": "en-ZA",
  "jurisdiction": "South Africa (SADC-RTSM aligned)",
  "series": {
    "seriesId": "R500",
    "seriesName": "Secondary regulatory signs",
    "class": "Regulatory",
    "groupName": "SECONDARY",
    "seriesPurpose": "R500 series signs provide supplementary information that modifies, qualifies, or limits the application of a primary regulatory sign."
  },

  "authoritativeBasis": {
    "primarySources": [
      {
        "title": "SADC Road Traffic Signs Manual (RTSM) Volume 1 – Regulatory Signs",
        "scopeUsed": [
          "Definition and function of secondary regulatory signs",
          "Rules governing use of supplementary plates",
          "Colour and pairing requirements with primary regulatory signs"
        ]
      },
      {
        "title": "SADC Road Traffic Signs Manual (RTSM) Volume 4 – Regulatory sign plates",
        "scopeUsed": [
          "R500 series identification and contextual references"
        ]
      }
    ],
    "performanceStandards": {
      "included": false,
      "note": "Material performance and retroreflective class requirements (e.g. SANS 1519) are excluded at this stage."
    }
  },

  "designRules": {
    "shape": "Rectangular (supplementary plate format)",
    "colourDependency": {
      "rule": "R500 signs shall use the same colour scheme as the primary regulatory sign to which they are attached.",
      "examples": [
        "Blue/white when paired with R100 command signs",
        "White/red/black when paired with R200 prohibition signs",
        "Yellow/black when paired with R300 reservation signs",
        "Blue/white/red when paired with R400 comprehensive signs"
      ]
    },
    "generalNotes": [
      "R500 signs shall never be used on their own.",
      "R500 signs must always be displayed in conjunction with a primary regulatory sign."
    ]
  },

  "applicationRules": {
    "primaryFunction": [
      "Limit the applicability of a regulatory sign by time",
      "Limit applicability by vehicle class",
      "Limit applicability by direction, distance, or condition"
    ],
    "positioning": {
      "relativePlacement": "Mounted immediately below the primary regulatory sign.",
      "stackingRules": [
        "Where multiple R500 signs are used, they must be arranged in a logical top-to-bottom order.",
        "The primary regulatory sign must always appear above all R500 signs."
      ]
    },
    "legalEffect": {
      "scope": "R500 signs do not create new regulations.",
      "effect": "They modify the extent or conditions under which the primary regulation applies."
    }
  },

  "combinationRules": {
    "compatiblePrimarySeries": [
      "R1–R6 (control signs)",
      "R100 (command signs)",
      "R200 (prohibition signs)",
      "R300 (reservation signs)",
      "R400 (comprehensive signs)"
    ],
    "incompatibleUsage": [
      "Use without a primary regulatory sign",
      "Use as a standalone regulatory instruction"
    ]
  },

  "signIndex": {
    "note": "R500 signs are defined functionally rather than exhaustively enumerated by code in text. Specific plate designs and legends are shown primarily in sign plates.",
    "commonFunctions": [
      {
        "function": "Time restriction",
        "examples": [
          "Specific hours of operation",
          "Days of the week",
          "Public holidays"
        ]
      },
      {
        "function": "Vehicle class restriction",
        "examples": [
          "Buses only",
          "Goods vehicles",
          "Motorcycles",
          "Axle or mass-based categories"
        ]
      },
      {
        "function": "Distance or extent",
        "examples": [
          "For next 500 m",
          "For next 2 km",
          "Within marked area"
        ]
      }
    ]
  },

  "knownSeriesCharacteristics": {
    "dependency": "R500 signs are entirely dependent on the primary sign above them.",
    "languageUsage": "May include text, symbols, or both, depending on the restriction conveyed.",
    "flexibility": "Allows precise tailoring of regulatory intent without creating new sign classes."
  },

  "links": {
    "parentIndex": "/ai/road-signs.json",
    "seriesCatalogue": "/ai/road-signs/r-series.json",
    "relatedSeries": [
      "/ai/road-signs/signs/R1-R6.json",
      "/ai/road-signs/signs/R100.json",
      "/ai/road-signs/signs/R200.json",
      "/ai/road-signs/signs/R300.json",
      "/ai/road-signs/signs/R400-R499.json",
      "/ai/road-signs/signs/R600.json"
    ]
  },

  "dataQuality": {
    "method": "Information is based strictly on RTSM functional definitions of secondary regulatory signs.",
    "limitations": [
      "Individual R500 plate codes are not exhaustively listed due to plate-based representation in RTSM.",
      "Exact legends and dimensions require visual plate extraction from Vol 4."
    ],
    "plannedEnhancements": [
      "Add structured legend templates once plate graphics are extracted.",
      "Add SANS 1519 performance requirements in a later revision."
    ]
  },

  "disclaimer": "This file provides a structured description of the R500 Secondary Regulatory sign series based on supplied RTSM documents. Always refer to the latest official RTSM manuals and road authority approvals for implementation."
}

}