{
  "dataset": {
    "name": "U.S. Loading Dock Dimensions Source Matrix",
    "identifier": "MDDR-LDD-2026.07.22-v2",
    "version": "2026.07.22-v2",
    "datePublished": "2026-07-22",
    "dateModified": "2026-07-22",
    "publisher": "Memphis Dock Door Repair Research",
    "url": "https://memphisdockdoorrepair.com/research/loading-dock-dimensions/",
    "license": "https://creativecommons.org/publicdomain/zero/1.0/",
    "description": "Source-classified United States reference dataset covering loading dock height, vehicle bed height, nominal and usable door openings, berths, bay width, dock-position center distance, apron space, approach grade, dock leveler working ranges, product-specific pit dimensions, operating demand, and reproducible screening calculations.",
    "schema_fields": ["record_id","dimension_category","variable","value_min","value_max","value_text","unit","condition","source_class","source_organization","source_title","source_revision","source_page_or_section","source_url","verified_date","universal_standard","calculator_use","derived_from_record_ids","notes"]
  },
  "source_records": [
    {"record_id":"GSA-H-001","dimension_category":"dock-height","variable":"Trailer-height dock reference","value_min":48,"value_max":48,"value_text":"Generally 48 in","unit":"inches","condition":"Blue instructional text","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"§3.48 blue instructional text","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Display as scoped reference only","derived_from_record_ids":null,"notes":"Instructional text only; not the operative clause"},
    {"record_id":"GSA-DOOR-001","dimension_category":"door-size","variable":"Dock-high door opening","value_min":96,"value_max":96,"value_text":"Min 8 ft wide x 10 ft high; approx 48 in above exterior grade","unit":"feet and inches","condition":"GSA warehouse lease template scope","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"§3.48 operative clause","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Compare with actual usable opening","derived_from_record_ids":null,"notes":"Nominal opening; usable opening requires intrusion subtraction"},
    {"record_id":"GSA-DOOR-002","dimension_category":"door-size","variable":"Drive-in door opening","value_min":144,"value_max":144,"value_text":"Min 12 ft wide x 16 ft high","unit":"feet and inches","condition":"GSA warehouse lease template scope","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"§3.48","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Separate from dock-high door","derived_from_record_ids":null,"notes":"Different opening type; do not merge with dock-high values"},
    {"record_id":"GSA-RAMP-001","dimension_category":"grade","variable":"Drive-in and small-truck/van ramp grade","value_min":null,"value_max":8.3,"value_text":"Maximum 8.3% with stricter local code where stated","unit":"percent","condition":"Applicable ramp only","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"§3.48","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Compare only with applicable ramp and equipment limits","derived_from_record_ids":null,"notes":"Subject to local code"},
    {"record_id":"GSA-DRAIN-001","dimension_category":"grade","variable":"Loading-area drainage","value_min":2,"value_max":2,"value_text":"1:50 equal to 2%","unit":"percent","condition":"Drainage reference","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"§3.48","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Drainage reference; not a vehicle-operating limit","derived_from_record_ids":null,"notes":"Not a vehicle-operating limit"},
    {"record_id":"GSA-HEAD-001","dimension_category":"headroom","variable":"Loading-berth and apron headroom","value_min":180,"value_max":180,"value_text":"Minimum 15 ft","unit":"inches","condition":"May need increase for grade transition and actual vehicle","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"§3.48","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Reference only","derived_from_record_ids":null,"notes":"Increase may be required for grade and vehicle"},
    {"record_id":"GSA-BERTH-001","dimension_category":"bay-width","variable":"Single loading berth width","value_min":180,"value_max":180,"value_text":"Minimum 15 ft","unit":"inches","condition":"Subject to local zoning and agency conditions","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"Loading-berth provisions","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Reference only","derived_from_record_ids":null,"notes":"Subject to template conditions"},
    {"record_id":"GSA-BERTH-002","dimension_category":"bay-width","variable":"Additional contiguous berth width","value_min":144,"value_max":144,"value_text":"12 ft","unit":"inches","condition":"Applies to contiguous additional berths","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"Loading-berth provisions","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Reference only","derived_from_record_ids":null,"notes":"Contiguous berths only"},
    {"record_id":"GSA-APRON-001","dimension_category":"apron-depth","variable":"Apron depth method","value_min":null,"value_max":null,"value_text":"Berth length + 2 ft","unit":"feet","condition":"Source-specific method","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"Loading-berth provisions","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Retain berth definition and project scope","derived_from_record_ids":null,"notes":"Retain berth definition"},
    {"record_id":"GSA-APRON-002","dimension_category":"grade","variable":"Apron drainage and grade","value_min":2,"value_max":8.3,"value_text":"Min 2% positive drainage; slopes away from dock; max 8.3%","unit":"percent","condition":"GSA apron conditions","source_class":"Government project template","source_organization":"U.S. General Services Administration","source_title":"Warehouse Lease Template L201WH","source_revision":"May 2025","source_page_or_section":"Loading-berth provisions","source_url":"https://www.gsa.gov/system/files/Warehouse%20Lease%20Template%20L201WH%20%28May%202025%29.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Not a universal equipment or site limit","derived_from_record_ids":null,"notes":"Not a universal limit"},
    {"record_id":"WBDG-H-001","dimension_category":"dock-height","variable":"Typical dock height","value_min":55,"value_max":55,"value_text":"55 in above grade","unit":"inches","condition":"Public-sector design reference","source_class":"Public-sector design guidance","source_organization":"Whole Building Design Guide","source_title":"Loading Dock","source_revision":"Undated (verified 2026-07-22)","source_page_or_section":"Loading Dock","source_url":"https://www.wbdg.org/space-types/loading-dock","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Display as scoped reference; not a national minimum","derived_from_record_ids":null,"notes":"Do not convert into a national minimum"},
    {"record_id":"WBDG-LEVEL-001","dimension_category":"leveler-range","variable":"Bed-height variation trigger for dock leveler","value_min":18,"value_max":18,"value_text":"More than 18 in variation calls for at least one berth with leveler","unit":"inches","condition":"Planning trigger","source_class":"Public-sector design guidance","source_organization":"Whole Building Design Guide","source_title":"Loading Dock","source_revision":"Undated (verified 2026-07-22)","source_page_or_section":"Loading Dock","source_url":"https://www.wbdg.org/space-types/loading-dock","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Planning trigger; equipment range still governs","derived_from_record_ids":null,"notes":"Trigger only; selected equipment governs"},
    {"record_id":"WBDG-RAMP-001","dimension_category":"grade","variable":"Delivery ramp grade","value_min":null,"value_max":8.33,"value_text":"Maximum 1:12 about 8.33%","unit":"percent","condition":"Delivery-ramp reference","source_class":"Public-sector design guidance","source_organization":"Whole Building Design Guide","source_title":"Loading Dock","source_revision":"Undated (verified 2026-07-22)","source_page_or_section":"Loading Dock","source_url":"https://www.wbdg.org/space-types/loading-dock","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Do not interchange with drainage grades","derived_from_record_ids":null,"notes":"Delivery ramp only"},
    {"record_id":"VA-VEH-001","dimension_category":"design-vehicle","variable":"Design vehicle selection","value_min":null,"value_max":null,"value_text":"Accommodate the largest service vehicle","unit":"category","condition":"VA project guidance","source_class":"Public-agency design guidance","source_organization":"U.S. Department of Veterans Affairs","source_title":"Site Design Manual","source_revision":"Revised March 1 2024","source_page_or_section":"§4.3.4","source_url":"https://www.cfm.va.gov/til/dManual/dmSite.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Vehicle-selection method for VA projects","derived_from_record_ids":null,"notes":"VA projects; actual vehicle is input"},
    {"record_id":"VA-TURN-001","dimension_category":"apron-depth","variable":"Refuse-hauler maneuvering verification","value_min":null,"value_max":null,"value_text":"Turning-movement program; no more than three-point turn; account for adjacent positions","unit":"method","condition":"VA refuse-hauler guidance","source_class":"Public-agency design guidance","source_organization":"U.S. Department of Veterans Affairs","source_title":"Site Design Manual","source_revision":"Revised March 1 2024","source_page_or_section":"§4.3.4.1","source_url":"https://www.cfm.va.gov/til/dManual/dmSite.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Do not generalize to every dock project","derived_from_record_ids":null,"notes":"VA refuse-hauler condition; do not generalize"},
    {"record_id":"NOVA-BAY-001","dimension_category":"bay-width","variable":"Loading bay width","value_min":144,"value_max":168,"value_text":"At least 12 ft; 14 ft recommended","unit":"inches","condition":"Dated 2013 preliminary reference","source_class":"Manufacturer planning guidance","source_organization":"NOVA Technology International","source_title":"Dock Planning Standards","source_revision":"2013","source_page_or_section":"Bay-width guidance","source_url":"https://www.novalocks.com/wp-content/uploads/Dock-Planning-Standards-Guide.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Dated reference; compare with actual operations","derived_from_record_ids":null,"notes":"2013 manufacturer planning guide"},
    {"record_id":"NOVA-CENTER-GENERAL-001","dimension_category":"centerline-spacing","variable":"Recommended center distance between dock positions","value_min":144,"value_max":144,"value_text":"12 ft minimum","unit":"inches","condition":"Apron-planning reference","source_class":"Manufacturer planning guidance","source_organization":"NOVA Technology International","source_title":"Dock Planning Standards","source_revision":"2013","source_page_or_section":"Apron-planning guidance","source_url":"https://www.novalocks.com/wp-content/uploads/Dock-Planning-Standards-Guide.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Not a universal code minimum","derived_from_record_ids":null,"notes":"2013 apron-planning reference"},
    {"record_id":"NOVA-CENTER-001","dimension_category":"centerline-spacing","variable":"Dock-position center distance where swinging trailer doors operate","value_min":168,"value_max":168,"value_text":"At least 14 ft","unit":"inches","condition":"Swinging trailer doors condition","source_class":"Manufacturer planning guidance","source_organization":"NOVA Technology International","source_title":"Dock Planning Standards","source_revision":"2013","source_page_or_section":"Swinging-door guidance","source_url":"https://www.novalocks.com/wp-content/uploads/Dock-Planning-Standards-Guide.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Not a universal code minimum","derived_from_record_ids":null,"notes":"Source-specific operating condition"},
    {"record_id":"NOVA-DOOR-001","dimension_category":"door-size","variable":"Common and full-access door references","value_min":96,"value_max":102,"value_text":"Common: 8 ft wide with 8/9/10 ft heights; full access: min 8 ft 6 in wide","unit":"feet and inches","condition":"2013 reference; calculate usable clear opening after intrusion","source_class":"Manufacturer planning guidance","source_organization":"NOVA Technology International","source_title":"Dock Planning Standards","source_revision":"2013","source_page_or_section":"Door guidance","source_url":"https://www.novalocks.com/wp-content/uploads/Dock-Planning-Standards-Guide.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Calculate actual usable clear opening","derived_from_record_ids":null,"notes":"2013 manufacturer planning guidance"},
    {"record_id":"NOVA-APRON-001","dimension_category":"apron-depth","variable":"Typical 40-ft-container-rig apron table","value_min":108,"value_max":120,"value_text":"108-120 ft at 12-18-ft dock centers","unit":"feet","condition":"2013 manufacturer scenario","source_class":"Manufacturer planning guidance","source_organization":"NOVA Technology International","source_title":"Dock Planning Standards","source_revision":"2013","source_page_or_section":"Table 1","source_url":"https://www.novalocks.com/wp-content/uploads/Dock-Planning-Standards-Guide.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Preserve as discrete source scenario","derived_from_record_ids":null,"notes":"Source-specific scenario; do not interpolate"},
    {"record_id":"NOVA-TRUCK-001","dimension_category":"vehicle-bed-height","variable":"Preliminary six-category bed-height envelope","value_min":36,"value_max":62,"value_text":"36-62 in","unit":"inches","condition":"2013 preliminary reference preset; replace with measured vehicles","source_class":"Manufacturer planning guidance","source_organization":"NOVA Technology International","source_title":"Dock Planning Standards","source_revision":"2013","source_page_or_section":"Table 4","source_url":"https://www.novalocks.com/wp-content/uploads/Dock-Planning-Standards-Guide.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Preset only; replace with measured vehicles","derived_from_record_ids":null,"notes":"Dated 2013; replace before final design"},
    {"record_id":"CHALFANT-APRON-001","dimension_category":"apron-depth","variable":"Apron feasibility screen","value_min":null,"value_max":null,"value_text":"2 x total tractor-and-trailer length + 5-10 ft","unit":"feet","condition":"Screening only; final design requires swept path","source_class":"Manufacturer planning guidance","source_organization":"Chalfant Dock Equipment","source_title":"Loading Dock Apron Space","source_revision":"Undated (verified 2026-07-22)","source_page_or_section":"Online guidance","source_url":"https://chalfantusa.com/loading-dock-apron-space/","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Rule-of-thumb screening only","derived_from_record_ids":null,"notes":"Not a universal requirement"},
    {"record_id":"FHWA-WB67-001","dimension_category":"design-vehicle","variable":"WB-65 or WB-67 interstate-semitrailer row","value_min":882,"value_max":882,"value_text":"73.5 ft overall; double-asterisk footnote identifies 53-ft-trailer design vehicle","unit":"inches","condition":"Optional design-vehicle preset","source_class":"Official design-vehicle geometry","source_organization":"Federal Highway Administration","source_title":"Highway-Rail Crossing Handbook Appendix B","source_revision":"Third edition","source_page_or_section":"Table B-3","source_url":"https://highways.dot.gov/safety/hsip/xings/highway-rail-crossing-handbook-third-edition/b-appendix-components-highway-rail","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Use only when representative of project vehicle","derived_from_record_ids":null,"notes":"73.5 ft = 882 in"},
    {"record_id":"ECFR-WIDTH-001","dimension_category":"door-size","variable":"National Network vehicle-width context","value_min":102,"value_max":102,"value_text":"Generally 102 in with stated exceptions and permits","unit":"inches","condition":"National Network only; subject to exceptions","source_class":"Federal regulation","source_organization":"Electronic Code of Federal Regulations","source_title":"23 CFR 658.15 Width","source_revision":"Current","source_page_or_section":"§658.15","source_url":"https://www.ecfr.gov/current/title-23/chapter-I/subchapter-G/part-658/section-658.15","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Vehicle-envelope context only; not a dock-door requirement","derived_from_record_ids":null,"notes":"Not a dock-door requirement"},
    {"record_id":"OSHA-26-001","dimension_category":"regulatory","variable":"Dockboard duties","value_min":null,"value_max":null,"value_text":"Capacity; run-off protection; securement; vehicle-movement measures; handling","unit":"duties","condition":"Safety duties within provision scope","source_class":"Federal regulation","source_organization":"Occupational Safety and Health Administration","source_title":"29 CFR 1910.26 Dockboards","source_revision":"Current","source_page_or_section":"Full provision","source_url":"https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.26","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Educational reference; no geometric value","derived_from_record_ids":null,"notes":"No universal dock height/door/bay/apron value"},
    {"record_id":"OSHA-28-001","dimension_category":"regulatory","variable":"Dockboard fall-protection threshold","value_min":48,"value_max":120,"value_text":"4 ft or more with motorized-material-handling exception up to 10 ft","unit":"inches","condition":"Fall-protection scope; not a platform height","source_class":"Federal regulation","source_organization":"Occupational Safety and Health Administration","source_title":"29 CFR 1910.28(b)(4)","source_revision":"Current","source_page_or_section":"(b)(4) Dockboards","source_url":"https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.28","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Educational reference; neither number is a platform height","derived_from_record_ids":null,"notes":"Fall-protection scope only"},
    {"record_id":"OSHA-178-001","dimension_category":"regulatory","variable":"Powered-industrial-truck loading operations","value_min":null,"value_max":null,"value_text":"Brakes/chocks; semitrailer support; safe dock-edge distance; sufficient headroom","unit":"duties","condition":"Operational duties; not a complete geometric design standard","source_class":"Federal regulation","source_organization":"Occupational Safety and Health Administration","source_title":"29 CFR 1910.178(k) and (m)","source_revision":"Current","source_page_or_section":"(k) and (m)","source_url":"https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.178","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Educational reference only","derived_from_record_ids":null,"notes":"Not a complete geometric design standard"},
    {"record_id":"MHI-LODEM-001","dimension_category":"standards","variable":"Current listed dock-equipment standards","value_min":null,"value_max":null,"value_text":"ANSI MH30.1-2022; MH30.2-2022; MH30.3-2022","unit":"standard identifiers","condition":"Identifies current editions and subjects","source_class":"Voluntary consensus standard","source_organization":"MHI/Loading Dock Equipment Manufacturers Association","source_title":"LODEM standards registry","source_revision":"2022","source_page_or_section":"Standards listing","source_url":"https://www.mhi.org/lodem/specifications","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Identifies subjects only; clause-level requirements require standard text","derived_from_record_ids":null,"notes":"2022 editions"},
    {"record_id":"MEM-UDC-001","dimension_category":"local-code","variable":"Memphis/Shelby County local-code verification","value_min":null,"value_max":null,"value_text":"UDC is zoning and subdivision code; portal displays UDC Update 2025/2026 link","unit":"reference","condition":"Verification trigger only","source_class":"Local law or official code source","source_organization":"Memphis and Shelby County Division of Planning and Development","source_title":"Unified Development Code portal","source_revision":"2025/2026 update shown","source_page_or_section":"Online portal","source_url":"https://www.develop901.com/udc","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Verification trigger only","derived_from_record_ids":null,"notes":"Verify currently adopted text for project"},
    {"record_id":"NOVA-EOD-001","dimension_category":"leveler-range","variable":"Edge-of-dock leveler range","value_min":-5,"value_max":5,"value_text":"Maximum plus or minus 5-in height difference","unit":"inches","condition":"Named document and configuration only","source_class":"Product-specific specification","source_organization":"NOVA Technology International","source_title":"Mechanical EOD Dock Leveler Owner's/User's Manual","source_revision":"September 2018","source_page_or_section":"Full manual","source_url":"https://www.novalocks.com/wp-content/uploads/NOVA-Mechanical-Edge-of-Dock-Leveler_Rev.-9-2018.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Named product example only; service height may vary","derived_from_record_ids":null,"notes":"Service height may vary with design specifications"},
    {"record_id":"NOVA-NHS-001","dimension_category":"leveler-range","variable":"Hydraulic leveler range","value_min":-12,"value_max":12,"value_text":"Designed to compensate for max plus or minus 12-in height difference or 24 in total","unit":"inches","condition":"Named document and configuration only","source_class":"Product-specific specification","source_organization":"NOVA Technology International","source_title":"NHS Hydraulic Dock Leveler Owner's/User's Manual","source_revision":"January 2021","source_page_or_section":"Full manual","source_url":"https://www.novalocks.com/wp-content/uploads/NOVA-NHS-Hydraulic-Dock-Leveler-Owners-Manual_1-2021-1.pdf","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Named product example only; service height may vary","derived_from_record_ids":null,"notes":"Service height may vary with design specifications"},
    {"record_id":"BG-M-001","dimension_category":"leveler-pit","variable":"Model M pit sizes and working range","value_min":null,"value_max":null,"value_text":"Widths 74/80/85 in; lengths 63/87/111 in; depths 20/19.5 in; range 12 in above and 12 in below","unit":"inches","condition":"Named product-family example","source_class":"Product-specific specification","source_organization":"Blue Giant Equipment Corporation","source_title":"Model M Mechanical Dock Leveler specification","source_revision":"Undated (verified July 2026)","source_page_or_section":"Full specification","source_url":"https://www.bluegiant.com/getattachment/7fdda7ac-b7f0-4ff5-acc6-770956f7cd46/Mechanical_Dock_Leveler_Spec.pdf?ext=.pdf&lang=en-us","verified_date":"2026-07-22","universal_standard":false,"calculator_use":"Named model example; use current submittal for construction","derived_from_record_ids":null,"notes":"Use selected model's current submittal"}
  ],
  "derived_records": [
    {"record_id":"DER-HEIGHT-001","dimension_category":"dock-height","variable":"Height difference between GSA and WBDG dock references","value_min":7,"value_max":7,"value_text":"55 − 48","unit":"inches","condition":"Scope comparison; not a tolerance","source_class":"Project measurement or original derivation","derived_from_record_ids":["GSA-H-001","WBDG-H-001"],"formula":"55 − 48","result":7,"notes":"Not an allowable construction tolerance"},
    {"record_id":"DER-REF-001","dimension_category":"vehicle-bed-height","variable":"Width of NOVA preliminary reference envelope","value_min":26,"value_max":26,"value_text":"62 − 36","unit":"inches","condition":"Describes 2013 preliminary envelope; not every U.S. vehicle","source_class":"Project measurement or original derivation","derived_from_record_ids":["NOVA-TRUCK-001"],"formula":"62 − 36","result":26,"notes":"Not a national fleet observation"},
    {"record_id":"DER-FEAS-001","dimension_category":"leveler-range","variable":"Fleet feasibility interval using NHS maximum range","value_min":null,"value_max":null,"value_text":"No feasible single-height interval: [62−12, 36+12]=[50, 48]","unit":"interval","condition":"Vertical-only screen; does not establish full compatibility","source_class":"Project measurement or original derivation","derived_from_record_ids":["NOVA-TRUCK-001","NOVA-NHS-001"],"formula":"[max(hMax-A), min(hMin+B)]","result":"No feasible single-height interval (lower 50 > upper 48)","notes":"See DER-FEAS-001 calculation record JSON for full step-by-step"},
    {"record_id":"DER-WB67-001","dimension_category":"apron-depth","variable":"WB-67 apron feasibility screen","value_min":152,"value_max":157,"value_text":"2 × 73.5 + 5–10","unit":"feet","condition":"Manufacturer-guideline screening; not a universal requirement","source_class":"Project measurement or original derivation","derived_from_record_ids":["FHWA-WB67-001","CHALFANT-APRON-001"],"formula":"2 × 73.5 + 5 = 152; 2 × 73.5 + 10 = 157","result":"152–157 ft","notes":"Not a universal truck-court requirement"},
    {"record_id":"DER-DOOR-001","dimension_category":"door-size","variable":"9-ft clear-width screen","value_min":108,"value_max":108,"value_text":"102 + 3 + 3","unit":"inches","condition":"Editorial 3-in assumption per side; not a legal requirement","source_class":"Project measurement or original derivation","derived_from_record_ids":["ECFR-WIDTH-001"],"formula":"102 + 3 + 3","result":108,"notes":"Transparent opening screen; side allowance is editorial assumption"},
    {"record_id":"DER-OPENING-001","dimension_category":"door-size","variable":"Usable door width after intrusion","value_min":100,"value_max":100,"value_text":"108 − 4 − 4","unit":"inches","condition":"Illustrates nominal vs usable; project hardware governs","source_class":"Project measurement or original derivation","derived_from_record_ids":["DER-DOOR-001"],"formula":"108 − 4 − 4","result":100,"notes":"Project hardware and geometry govern"},
    {"record_id":"DER-BAYS-001","dimension_category":"bay-width","variable":"Four-bay dock-face span at 14-ft centers","value_min":51,"value_max":51,"value_text":"(4−1)×14+9","unit":"feet","condition":"Before project-specific end clearances","source_class":"Project measurement or original derivation","derived_from_record_ids":["NOVA-CENTER-001"],"formula":"(4 − 1) × 14 + 9","result":51,"notes":"Before end clearances, columns, controls, etc."},
    {"record_id":"DER-DEMAND-001","dimension_category":"dock-positions","variable":"Baseline dock-position count from NOVA worked example","value_min":4,"value_max":7,"value_text":"ceiling((36÷8)×0.75)=4; ceiling((36÷4)×0.75)=7","unit":"positions","condition":"Workload screen; not a queue model","source_class":"Project measurement or original derivation","derived_from_record_ids":["NOVA-TRUCK-001"],"formula":"ceiling(peakTrucksPerHour × avgOccupancyHours)","result":"4 positions (8-hr window); 7 positions (4-hr window)","notes":"Baseline concurrency only; not a probability-based queue model"}
  ]
}