{
  "revision": "F03",
  "status": "PRELIMINARY",
  "references": [
    {
      "url": "https://www.toodyay.wa.gov.au/documents/410/subdivisional-development-guidelines",
      "note": "Published 2014 document labelled draft; current applicability needs confirmation."
    },
    {
      "url": "https://www.mainroads.wa.gov.au/technical-commercial/technical-library/road-traffic-engineering/guide-to-road-design/mrwa-supplement-to-austroads-guide-to-road-design-part-4b/",
      "note": "Roundabout design reference; traffic/swept-path validation outstanding."
    },
    {
      "url": "https://www.mainroads.wa.gov.au/technical-commercial/technical-library/road-traffic-engineering/traffic-management/traffic-control-devices/chapter-2-signs-and-pavement-marking-guidelines/",
      "note": "Signs and pavement marking reference; diagram placement is provisional."
    },
    {
      "url": "https://www.wa.gov.au/government/document-collections/drainage-guidance-sub-division-and-development-planning",
      "note": "Catchment and urban water management investigations needed."
    }
  ],
  "assumptions": {
    "local_pavement_m": 6,
    "collector_pavement_m": 7,
    "local_reserve_m": 20,
    "collector_reserve_m": 28,
    "crown_pct": 3,
    "local_target_radius_m": 45,
    "collector_target_radius_m": 90,
    "grade_screen_pct": 10,
    "vertical_K_screen_m_per_percent": 6,
    "minimum_lot_m2": 1011.7141056,
    "envelope_m2": 330,
    "envelope_slope_screen_pct": 16,
    "access_ground_grade_screen_pct": 15
  },
  "book_pages": 680
}