{
  "_meta": {
    "study": "what-stops-things-fitting",
    "title": "What Stops Things From Fitting: route-blocker research",
    "source": "https://itemfits.com/data/what-stops-things-fitting",
    "permalink": "https://itemfits.com/data/what-stops-things-fitting",
    "citation": "ItemFits (2026). What Stops Things From Fitting. Among 627 failed route-related fit checks with a recorded binding constraint (2026-07-25 to 2026-09-09), No rotation fits was recorded in 438 checks. Version route-blockers/1. https://itemfits.com/data/what-stops-things-fitting",
    "reuseTerms": "Free to reuse with attribution to ItemFits. Cite the source URL below.",
    "publisher": "ItemFits",
    "generatedAt": "2026-09-09T21:50:55.735Z",
    "privacyCoverage": {
      "version": "explicit_web_messages_and_exclusive_web_sessions.v1",
      "sessionPopulation": "all_sessions_sharing_candidate_web_browser_keys",
      "observedSessionRows": 12055,
      "eligibleSessionRows": 10069,
      "excludedSessionRows": 1986,
      "eligibleBrowserKeys": 10069,
      "consistency": "bounded_reads_not_transaction_snapshot",
      "sources": {
        "fit_check_results": {
          "privacyEligibleRows": 7583,
          "analyzedAfterQa": 7526
        },
        "query_telemetry": {
          "privacyEligibleRows": 12573,
          "analyzedAfterQa": 12510
        },
        "fit_results": {
          "privacyEligibleRows": 0,
          "analyzedAfterQaAndMarginFilter": 0
        },
        "query_result_cache": {
          "status": "withheld",
          "reason": "historical_contributor_provenance_unavailable"
        },
        "dimension_norm_stats": {
          "status": "withheld",
          "reason": "historical_contributor_provenance_unavailable"
        }
      }
    },
    "year": 2026,
    "temporalCoverage": "2026-07-25 to 2026-09-09",
    "totalChecksAnalyzed": 7526,
    "variableMeasured": [
      "failed_fit_check",
      "binding_constraint",
      "route_stage_category"
    ],
    "version": "route-blockers/1",
    "releaseHash": "da63b120ea7930e48e47160c58a1a8bf38382fa90c10bbbc0bb15dab8efd2d6c",
    "analysisContract": {
      "contractVersion": "route-blockers/1",
      "eligibleN": 627,
      "publishable": true,
      "minimums": {
        "headline_n": 30,
        "cell_n": 10
      },
      "cohort": {
        "qa_clean_rows_n": 7526,
        "route_rows_n": 1577,
        "failed_route_rows_n": 627,
        "eligible_failed_route_rows_n": 627,
        "eligible_timestamp_range": {
          "start_at": "2026-07-25T01:31:33.854622+00:00",
          "end_at": "2026-09-09T21:22:14.971329+00:00"
        },
        "excluded_missing_constraint_n": 0,
        "excluded_non_route_n": 5949,
        "excluded_query_types": {
          "batch-vehicle": 178,
          "batch_doorway": 17,
          "capacity": 66,
          "container": 2,
          "container_fit": 204,
          "dimension_info": 37,
          "hybrid": 196,
          "inventory_fit": 153,
          "move_size": 9,
          "multi_constraint": 37,
          "multi_step": 53,
          "room": 22,
          "room_fit": 426,
          "slot": 3,
          "slot_fit": 75,
          "turn_required_width": 1,
          "unknown_space": 4,
          "vehicle": 4441,
          "vehicle_in_space": 25
        }
      },
      "suppressedConstraintN": 22,
      "releaseHash": "da63b120ea7930e48e47160c58a1a8bf38382fa90c10bbbc0bb15dab8efd2d6c"
    }
  },
  "slices": {
    "constraint_mix_fail_route": [
      {
        "label": "no_orientation_fits",
        "n": 438,
        "display_label": "No rotation fits"
      },
      {
        "label": "elevator_door",
        "n": 34,
        "display_label": "Elevator door"
      },
      {
        "label": "stair_width",
        "n": 29,
        "display_label": "Stair width"
      },
      {
        "label": "stair_headroom",
        "n": 28,
        "display_label": "Stair headroom"
      },
      {
        "label": "cab_depth",
        "n": 25,
        "display_label": "Elevator cab depth"
      },
      {
        "label": "width",
        "n": 20,
        "display_label": "Doorway/opening width"
      },
      {
        "label": "depth",
        "n": 20,
        "display_label": "Available depth"
      },
      {
        "label": "height",
        "n": 11,
        "display_label": "Opening height"
      }
    ],
    "route_stage_fail_mix": [
      {
        "label": "opening",
        "n": 454
      },
      {
        "label": "elevator",
        "n": 95
      },
      {
        "label": "stairs",
        "n": 71
      },
      {
        "label": "turn",
        "n": 6
      },
      {
        "label": "hallway",
        "n": 1
      }
    ],
    "constraint_mix_fail_by_stage": {
      "opening": {
        "n": 454,
        "suppressed_n": 1,
        "constraints": [
          {
            "label": "no_orientation_fits",
            "n": 438,
            "display_label": "No rotation fits"
          },
          {
            "label": "width",
            "n": 15,
            "display_label": "Doorway/opening width"
          }
        ]
      },
      "hallway": {
        "n": 1,
        "suppressed_n": 1,
        "constraints": []
      },
      "stairs": {
        "n": 71,
        "suppressed_n": 14,
        "constraints": [
          {
            "label": "stair_width",
            "n": 29,
            "display_label": "Stair width"
          },
          {
            "label": "stair_headroom",
            "n": 28,
            "display_label": "Stair headroom"
          }
        ]
      },
      "elevator": {
        "n": 95,
        "suppressed_n": 6,
        "constraints": [
          {
            "label": "elevator_door",
            "n": 34,
            "display_label": "Elevator door"
          },
          {
            "label": "cab_depth",
            "n": 25,
            "display_label": "Elevator cab depth"
          },
          {
            "label": "depth",
            "n": 20,
            "display_label": "Available depth"
          },
          {
            "label": "height",
            "n": 10,
            "display_label": "Opening height"
          }
        ]
      },
      "turn": {
        "n": 6,
        "suppressed_n": 6,
        "constraints": []
      }
    }
  }
}