SECTION 20 — TRAN LANE DEEP DIVE (Z6→Z0)

# ============================================================
# LONDON CITY OS — ALMOST-CODE (CANON) — v0.1
# SECTION 20 — TRAN LANE DEEP DIVE (Z6→Z0)
#   Transport = moving people + goods + emergency response mobility across modes.
#   Goal: keep corridors reliable under variance; prevent local failures cascading citywide.
# ============================================================
CANON_VERSION: "v0.1"
PLACE:
  place_id: "GBR-LON"
  place_name: "London"
  lane: "TRAN"
  z_scope: "Z6_to_Z0"
  pack: "TRAN_DEEP_DIVE"
  depends_on_sections:
    - "SECTION_07_SENSORS_PACK"
    - "SECTION_08_ROUTER_CORE"
    - "SECTION_11_EVENT_SURGE"
    - "SECTION_12_GOV_GRAPH"
    - "SECTION_13_LANE_DIRECTORY_INDEX"
# ------------------------------------------------------------
# 20A) Definition locks (transport-specific)
# ------------------------------------------------------------
DEFINITION_LOCK:
  CORRIDOR:
    >
    A repeatable movement channel with capacity, reliability, and choke points
    (rail line segment, major road, bridge, station complex, airport access chain, river channel).
  INTERCHANGE_NODE:
    >
    A node where multiple corridors couple (major stations, major road junctions, airport terminals).
    Coupling amplifies cascades.
  HEADWAY_STABILITY:
    >
    Regular spacing of vehicles/trains. Instability creates bunching, crowding, knock-on delays.
  CROWDING_PRESSURE:
    >
    Station/platform load nearing safe operating thresholds (queue fields form).
  SERVICE_RELIABILITY:
    >
    Probability trips complete within acceptable delay bands under normal variance.
  FREIGHT_CONTINUITY:
    >
    Ability to move essential goods (food, medicine, repair parts, fuel) through the city.
  TRAN_P0:
    >
    Below-threshold city mobility: multi-corridor stoppage, or unsafe crowding,
    or major interchange failure, or persistent gridlock preventing emergency movement.
  STITCHING_RULE:
    >
    Restore without secondary harms:
    (a) avoid releasing crowds into unsafe spaces,
    (b) avoid "catch-up surge" that re-breaks headways,
    (c) coordinate diversion so one mode does not overload another.
# ------------------------------------------------------------
# 20B) Z6 org anchors (minimal viable London transport stack)
# ------------------------------------------------------------
ORG_REGISTRY_Z6:
  GBR-LON::TRAN::Z6::ORG.INTEGRATED_TRANSPORT_AUTHORITY:
    org_kind: "CITY_TRANSPORT_AUTHORITY"
    canonical_real_world: "TfL"
    scope: ["URBAN_RAIL","BUSES","STREET_MANAGEMENT (MAIN_ROADS)","CYCLING_WALKING","FARES_POLICY","INCIDENT_COMMS"]
  GBR-GB::TRAN::Z6::ORG.RAIL_INFRASTRUCTURE:
    org_kind: "RAIL_INFRASTRUCTURE_MANAGER"
    canonical_real_world: "Network Rail"
    scope: ["TRACK_SIGNAL_POWER_INFRA","MAJOR_STATIONS","CONTROL_CENTRES","POSSESSION_MGMT"]
  GBR-ENG::TRAN::Z6::ORG.STRATEGIC_ROADS_OUTSIDE_TFL:
    org_kind: "STRATEGIC_ROADS_OPERATOR"
    canonical_real_world: "National Highways"
    scope: ["MOTORWAYS_MAJOR_A_ROADS","INCIDENT_RESPONSE","MAINTENANCE","TRAFFIC_TECH"]
  GBR-LON::TRAN::Z6::ORG.BOROUGH_ROAD_AUTHORITIES:
    org_kind: "LOCAL_ROADS"
    scope: ["NON_TFL_ROADS","LOCAL_WORKS","LOCAL_DIVERSION_SUPPORT"]
    note: "Enumerate borough-by-borough later."
  GBR-LON::TRAN::Z6::ORG.RIVER_NAVIGATION_SAFETY:
    org_kind: "RIVER_TRAFFIC_AUTHORITY"
    canonical_real_world: "Port of London Authority"
    scope: ["VTS","PILOTAGE","NAVIGATION_SAFETY","INCIDENT_ROUTING_ON_RIVER"]
  GBR-UK::TRAN::Z6::ORG.AIRPORT_OPERATOR_HEATHROW:
    org_kind: "AIRPORT_OPERATOR"
    canonical_real_world: "Heathrow Airport Holdings Ltd"
    scope: ["AIRPORT_OPERATIONS","TERMINAL_FLOW","RUNWAY_OPS","PASSENGER_MANAGEMENT"]
  GBR-UK::TRAN::Z6::ORG.AVIATION_REGULATOR:
    org_kind: "AVIATION_REGULATION"
    canonical_real_world: "UK Civil Aviation Authority"
    scope: ["AERODROME_LICENSING","SAFETY","CONSUMER_REQUIREMENTS","AERODROME_CHANGE_CONTROL"]
  GBR-UK::TRAN::Z6::ORG.POLICY_OWNER:
    org_kind: "NATIONAL_POLICY"
    canonical_real_world: "DfT (policy surface)"
    scope: ["RAIL_POLICY","ROAD_POLICY","AVIATION_POLICY","EMERGENCY_FRAMEWORKS"]
# ------------------------------------------------------------
# 20C) Z5 control nodes (who executes)
# ------------------------------------------------------------
CONTROL_NODES_Z5:
  GBR-LON::TRAN::Z5::CTRL.URBAN_RAIL_CONTROL:
    owner_org: "GBR-LON::TRAN::Z6::ORG.INTEGRATED_TRANSPORT_AUTHORITY"
    node_kind: "METRO_AND_URBAN_RAIL_OPERATIONS"
    can_execute:
      - "ACT.TRAN.LINE_ISOLATION"
      - "ACT.TRAN.SERVICE_PATTERN_CHANGE"
      - "ACT.TRAN.SPEED_RESTRICTION"
      - "ACT.TRAN.STATION_CROWD_CONTROL"
      - "ACT.TRAN.PUBLISH_RAIL_STATUS"
  GBR-LON::TRAN::Z5::CTRL.BUS_SURFACE_CONTROL:
    owner_org: "GBR-LON::TRAN::Z6::ORG.INTEGRATED_TRANSPORT_AUTHORITY"
    node_kind: "BUS_NETWORK_AND_SURFACE_TRANSPORT"
    can_execute:
      - "ACT.TRAN.BUS_BRIDGE_DEPLOY"
      - "ACT.TRAN.ROUTE_REALLOCATION"
      - "ACT.TRAN.BUS_PRIORITY_MODE"
      - "ACT.TRAN.PUBLISH_BUS_STATUS"
  GBR-LON::TRAN::Z5::CTRL.ROAD_NETWORK_CONTROL_TFL:
    owner_org: "GBR-LON::TRAN::Z6::ORG.INTEGRATED_TRANSPORT_AUTHORITY"
    node_kind: "MAIN_ROADS_CONTROL"
    can_execute:
      - "ACT.TRAN.ROAD_INCIDENT_DIVERSION"
      - "ACT.TRAN.RED_ROUTE_FLOW_CONTROL"
      - "ACT.TRAN.WORKS_DESTACK"
      - "ACT.TRAN.SIGNAL_TIMING_MODE"
      - "ACT.TRAN.PUBLISH_ROAD_STATUS"
  GBR-LON::TRAN::Z5::CTRL.ROAD_NETWORK_CONTROL_BOROUGHS:
    owner_org: "GBR-LON::TRAN::Z6::ORG.BOROUGH_ROAD_AUTHORITIES"
    node_kind: "LOCAL_ROADS_CONTROL"
    can_execute:
      - "ACT.TRAN.LOCAL_DIVERSION_SUPPORT"
      - "ACT.TRAN.LOCAL_WORKS_GATE"
  GBR-GB::TRAN::Z5::CTRL.MAINLINE_RAIL_CONTROL:
    owner_org: "GBR-GB::TRAN::Z6::ORG.RAIL_INFRASTRUCTURE"
    node_kind: "SIGNALLING_AND_ROUTE_CONTROL"
    can_execute:
      - "ACT.TRAN.SIGNAL_FAILURE_CONTAIN"
      - "ACT.TRAN.ROUTE_RECONFIGURATION"
      - "ACT.TRAN.POSSESSION_GATE"
      - "ACT.TRAN.PUBLISH_MAINLINE_STATUS"
  GBR-LON::TRAN::Z5::CTRL.RIVER_TRAFFIC_CONTROL:
    owner_org: "GBR-LON::TRAN::Z6::ORG.RIVER_NAVIGATION_SAFETY"
    node_kind: "VTS_AND_PILOTAGE"
    can_execute:
      - "ACT.TRAN.RIVER_CHANNEL_CONTROL"
      - "ACT.TRAN.RIVER_INCIDENT_RESPONSE"
      - "ACT.TRAN.PUBLISH_RIVER_STATUS"
  GBR-UK::TRAN::Z5::CTRL.AIRPORT_OPERATIONS_HEATHROW:
    owner_org: "GBR-UK::TRAN::Z6::ORG.AIRPORT_OPERATOR_HEATHROW"
    node_kind: "AIRPORT_FLOW_CONTROL"
    can_execute:
      - "ACT.TRAN.TERMINAL_FLOW_MODE"
      - "ACT.TRAN.AIRPORT_DISRUPTION_ROUTER"
      - "ACT.TRAN.PUBLISH_AIRPORT_STATUS"
# ------------------------------------------------------------
# 20D) Z4 corridors (the pipes)
# ------------------------------------------------------------
CORRIDORS_Z4:
  GBR-LON::TRAN::Z4::CORR.URBAN_RAIL_METRO:
    payload: "HIGH_CAPACITY_PEOPLE_FLOW"
    anchors: ["CTRL.URBAN_RAIL_CONTROL"]
    invariants: ["HEADWAY_STABILITY","STATION_SAFETY"]
  GBR-LON::TRAN::Z4::CORR.MAINLINE_RAIL_IN_OUT:
    payload: "COMMUTER_INTERCITY_FREIGHT_ACCESS"
    anchors: ["CTRL.MAINLINE_RAIL_CONTROL"]
    invariants: ["SIGNAL_INTEGRITY","ROUTE_REDUNDANCY"]
  GBR-LON::TRAN::Z4::CORR.BUS_NETWORK:
    payload: "FLEXIBLE_SURFACE_PEOPLE_FLOW"
    anchors: ["CTRL.BUS_SURFACE_CONTROL"]
    invariants: ["BUNCHING_CONTROL","ROAD_DEPENDENCY"]
  GBR-LON::TRAN::Z4::CORR.MAIN_ROADS_TFL_RED_ROUTES:
    payload: "CITY_MAIN_ROAD_FLOW"
    anchors: ["CTRL.ROAD_NETWORK_CONTROL_TFL"]
    invariants: ["EMERGENCY_MOVEMENT","FREIGHT_CONTINUITY","JUNCTION_STABILITY"]
  GBR-LON::TRAN::Z4::CORR.LOCAL_ROADS_BOROUGHS:
    payload: "DISTRIBUTION_STREETS"
    anchors: ["CTRL.ROAD_NETWORK_CONTROL_BOROUGHS"]
    invariants: ["DIVERSION_COMPATIBILITY"]
  GBR-ENG::TRAN::Z4::CORR.STRATEGIC_MOTORWAY_ACCESS:
    payload: "REGIONAL_ROAD_ACCESS"
    anchors: ["CTRL.ROAD_NETWORK_CONTROL_TFL","NationalHighwaysInterface (abstract)"]
    note: "Interface corridor between TfL network and strategic roads."
  GBR-LON::TRAN::Z4::CORR.CYCLING_WALKING:
    payload: "ACTIVE_MOBILITY"
    anchors: ["CTRL.ROAD_NETWORK_CONTROL_TFL"]
    invariants: ["SAFE_SPACE","EVENT_SURGE_RELIEF"]
  GBR-LON::TRAN::Z4::CORR.RIVER_TRANSPORT_AND_NAVIGATION:
    payload: "RIVER_MOVEMENT"
    anchors: ["CTRL.RIVER_TRAFFIC_CONTROL"]
    invariants: ["CHANNEL_SAFETY","VISIBILITY_RULES"]
  GBR-LON::TRAN::Z4::CORR.AIRPORT_ACCESS_AND_OPERATIONS:
    payload: "AVIATION_NODE + GROUND_ACCESS_CHAIN"
    anchors: ["CTRL.AIRPORT_OPERATIONS_HEATHROW","CTRL.URBAN_RAIL_CONTROL","CTRL.ROAD_NETWORK_CONTROL_TFL"]
    invariants: ["PASSENGER_FLOW_SAFETY","SECURITY_QUEUE_STABILITY"]
  GBR-LON::TRAN::Z4::CORR.FREIGHT_AND_LAST_MILE_LOGISTICS:
    payload: "GOODS_MOVEMENT"
    anchors: ["CTRL.ROAD_NETWORK_CONTROL_TFL","CTRL.MAINLINE_RAIL_CONTROL"]
    couples_to: ["WASTE","HEALTH","FOOD_SUPPLY (optional)","REPAIR_PARTS"]
# ------------------------------------------------------------
# 20E) Z3 portals (interfaces)
# ------------------------------------------------------------
PORTALS_Z3:
  GBR-LON::TRAN::Z3::PORTAL.MAJOR_STATIONS_INTERCHANGES:
    corridor: "CORR.URBAN_RAIL_METRO"
    portal_kind: "INTERCHANGE_NODE"
  GBR-LON::TRAN::Z3::PORTAL.STATION_GATES:
    corridor: "CORR.URBAN_RAIL_METRO"
    portal_kind: "CROWDING_VALVE_INTERFACE"
  GBR-LON::TRAN::Z3::PORTAL.DEPOTS_AND_STABLING:
    corridor: "CORR.BUS_NETWORK"
    portal_kind: "FLEET_BASE"
  GBR-LON::TRAN::Z3::PORTAL.MAJOR_JUNCTIONS:
    corridor: "CORR.MAIN_ROADS_TFL_RED_ROUTES"
    portal_kind: "CHOKE_NODE"
  GBR-LON::TRAN::Z3::PORTAL.BRIDGES_TUNNELS:
    corridor: "CORR.MAIN_ROADS_TFL_RED_ROUTES"
    portal_kind: "SINGLE_POINT_CHOKE"
  GBR-LON::TRAN::Z3::PORTAL.RIVER_PIERS:
    corridor: "CORR.RIVER_TRANSPORT_AND_NAVIGATION"
    portal_kind: "BOARDING_GATE"
  GBR-LON::TRAN::Z3::PORTAL.AIRPORT_TERMINALS:
    corridor: "CORR.AIRPORT_ACCESS_AND_OPERATIONS"
    portal_kind: "SECURITY_QUEUE_SYSTEM"
  GBR-LON::TRAN::Z3::PORTAL.AIRPORT_GROUND_ACCESS:
    corridor: "CORR.AIRPORT_ACCESS_AND_OPERATIONS"
    portal_kind: "MULTI_MODE_INTERFACE"
  GBR-LON::TRAN::Z3::PORTAL.PUBLIC_STATUS_CHANNELS:
    corridor: "CORR.URBAN_RAIL_METRO"
    portal_kind: "TRUST_INTERFACE"
# ------------------------------------------------------------
# 20F) Z3 valves (choke controls)
# ------------------------------------------------------------
VALVES_Z3:
  GBR-LON::TRAN::Z3::VALVE.LINE_ISOLATION:
    owner_ctrl: "CTRL.URBAN_RAIL_CONTROL"
    purpose: "truncate local failures; prevent network-wide propagation"
  GBR-LON::TRAN::Z3::VALVE.SERVICE_PATTERN_CHANGE:
    owner_ctrl: "CTRL.URBAN_RAIL_CONTROL"
    purpose: "run partial line / shuttle / skip-stop patterns to preserve headways"
  GBR-LON::TRAN::Z3::VALVE.STATION_CROWD_CONTROL:
    owner_ctrl: "CTRL.URBAN_RAIL_CONTROL"
    purpose: "gate/queue to prevent unsafe density; coordinate with surface diversion"
  GBR-LON::TRAN::Z3::VALVE.BUS_BRIDGE:
    owner_ctrl: "CTRL.BUS_SURFACE_CONTROL"
    purpose: "bridge rail failures; provide redundancy during disruptions"
  GBR-LON::TRAN::Z3::VALVE.RED_ROUTE_FLOW_CONTROL:
    owner_ctrl: "CTRL.ROAD_NETWORK_CONTROL_TFL"
    purpose: "keep emergency/freight movement viable; prevent gridlock cascades"
  GBR-LON::TRAN::Z3::VALVE.WORKS_DESTACK:
    owner_ctrl: "CTRL.ROAD_NETWORK_CONTROL_TFL"
    purpose: "avoid stacking planned road works with high-risk windows/events"
  GBR-GB::TRAN::Z3::VALVE.SIGNAL_FAILURE_CONTAINMENT:
    owner_ctrl: "CTRL.MAINLINE_RAIL_CONTROL"
    purpose: "isolate faulty signalling section; reroute where possible"
  GBR-LON::TRAN::Z3::VALVE.AIRPORT_FLOW_MODE:
    owner_ctrl: "CTRL.AIRPORT_OPERATIONS_HEATHROW"
    purpose: "control terminal/security queues; coordinate ground-access throttling"
  GBR-LON::TRAN::Z3::VALVE.RIVER_CHANNEL_CONTROL:
    owner_ctrl: "CTRL.RIVER_TRAFFIC_CONTROL"
    purpose: "maintain safe navigation; throttle/route vessels during incidents"
# ------------------------------------------------------------
# 20G) Z2 subnets (operational tiling)
# ------------------------------------------------------------
SUBNETS_Z2:
  GBR-LON::TRAN::Z2::SUBNET.CENTRAL_CORE:
    description: "highest interchange density; smallest disruptions amplify fastest"
  GBR-LON::TRAN::Z2::SUBNET.NORTH:
    description: "mixed residential + radial commuter corridors"
  GBR-LON::TRAN::Z2::SUBNET.WEST:
    description: "major airport coupling + trunk road pressure"
  GBR-LON::TRAN::Z2::SUBNET.EAST:
    description: "river + logistics + growth corridors; interchange coupling"
  GBR-LON::TRAN::Z2::SUBNET.SOUTH:
    description: "cross-river dependency; bridge/tunnel choke sensitivity"
  GBR-LON::TRAN::Z2::SUBNET.OUTER_RING:
    description: "orbital movement; diversion buffer when central core unstable"
# ------------------------------------------------------------
# 20H) Z1 cells (where failure first appears)
# ------------------------------------------------------------
CELLS_Z1:
  GBR-LON::TRAN::Z1::CELL.HEADWAY_VARIANCE_CLUSTER:
    surface_kind: "VARIANCE_FIELD"
    parent_corridor: "CORR.URBAN_RAIL_METRO"
  GBR-LON::TRAN::Z1::CELL.STATION_CROWDING_QUEUE:
    surface_kind: "QUEUE_FIELD"
    parent_portal: "PORTAL.STATION_GATES"
  GBR-LON::TRAN::Z1::CELL.SIGNAL_FAULT_FRONTIER:
    surface_kind: "INCIDENT_FIELD"
    parent_corridor: "CORR.MAINLINE_RAIL_IN_OUT"
  GBR-LON::TRAN::Z1::CELL.BUS_BUNCHING_CLUSTER:
    surface_kind: "VARIANCE_FIELD"
    parent_corridor: "CORR.BUS_NETWORK"
  GBR-LON::TRAN::Z1::CELL.RED_ROUTE_GRIDLOCK_PATCH:
    surface_kind: "INCIDENT_FIELD"
    parent_corridor: "CORR.MAIN_ROADS_TFL_RED_ROUTES"
  GBR-LON::TRAN::Z1::CELL.BRIDGE_TUNNEL_SINGLE_POINT_RISK:
    surface_kind: "LATENT_HAZARD_FIELD"
    parent_portal: "PORTAL.BRIDGES_TUNNELS"
  GBR-LON::TRAN::Z1::CELL.AIRPORT_QUEUE_SURGE:
    surface_kind: "QUEUE_FIELD"
    parent_portal: "PORTAL.AIRPORT_TERMINALS"
  GBR-LON::TRAN::Z1::CELL.DIVERSION_OVERLOAD_REBOUND:
    surface_kind: "REBOUND_RISK"
    parent_valve: "VALVE.BUS_BRIDGE"
# ------------------------------------------------------------
# 20I) Sensors (transport specialisations)
# ------------------------------------------------------------
SENSORS_TRAN:
  S.tran.rail_headway_variance:
    maps_to: "S.variance_index"
  S.tran.rail_cancellation_rate:
    maps_to: "S.incident_state"
  S.tran.station_crowding_index:
    maps_to: "S.queue_index"
  S.tran.station_gate_hold_time:
    maps_to: "S.backlog_age"
  S.tran.signal_failure_rate:
    maps_to: "S.incident_state"
  S.tran.bus_bunching_index:
    maps_to: "S.variance_index"
  S.tran.bus_bridge_capacity_delta:
    maps_to: "S.capacity_delta"
  S.tran.road_speed_index_red_routes:
    maps_to: "S.variance_index"
  S.tran.road_incident_rate:
    maps_to: "S.incident_state"
  S.tran.works_stack_index:
    maps_to: "S.rebound_risk"
  S.tran.emergency_vehicle_delay_proxy:
    maps_to: "S.queue_index"
  S.tran.airport_queue_time_proxy:
    maps_to: "S.queue_index"
  S.tran.airport_disruption_flag:
    maps_to: "S.incident_state"
  S.tran.river_channel_restriction_flag:
    maps_to: "S.incident_state"
  S.tran.freight_delay_proxy:
    maps_to: "S.queue_index"
  S.tran.public_trust_signal:
    maps_to: "S.substitution_pressure"
# ------------------------------------------------------------
# 20J) Tripwires (P1/P0) + truncation/stitch rules
# ------------------------------------------------------------
TRIPWIRES:
  TRAN_P1_EARLY_WARNING:
    if:
      - "rail_headway_variance rising 2 windows"
      - "OR station_crowding_index rising + gate_hold_time rising"
      - "OR road_speed_index_red_routes negative 2 windows"
      - "OR works_stack_index rising during high-demand window"
      - "OR airport_disruption_flag intermittent + airport_queue_time_proxy rising"
    then:
      - "activate PLAYBOOK.TRAN.CROWD_SAFETY_TRUNCATION"
      - "activate PLAYBOOK.TRAN.RAIL_FAULT_CONTAIN_AND_BRIDGE"
      - "activate PLAYBOOK.TRAN.RED_ROUTE_FLOW_PROTECTION"
      - "activate PLAYBOOK.TRAN.AIRPORT_SPILLOVER_ROUTER"
  TRAN_P1_TRIGGER:
    if:
      - "station_crowding_index > 55"
      - "OR rail_cancellation_rate spike"
      - "OR red_route_gridlock_patch expands"
      - "OR emergency_vehicle_delay_proxy rising across subnets"
    then:
      - "TRUNCATE: isolate failing corridor; gate stations; deploy bus bridge; divert roads"
      - "publish unified disruption plan (single comms spine)"
  TRAN_P0_TRIGGER:
    if:
      - "multi-corridor stoppage (rail + road) OR unsafe crowding risk"
      - "OR major interchange node disabled"
      - "OR persistent gridlock prevents emergency movement"
    then:
      - "HARD CONTAINMENT: crowd safety priority + emergency routing + staged restoration"
      - "stitch only after headway stability + crowding index returns below threshold band"
# ------------------------------------------------------------
# 20K) Playbooks (executable sequences)
# ------------------------------------------------------------
PLAYBOOK_LIBRARY:
  PLAYBOOK.TRAN.CROWD_SAFETY_TRUNCATION:
    intent: "Prevent unsafe station density and panic cascades."
    truncate:
      - {act: ACT.TRAN.STATION_CROWD_CONTROL, owner: "CTRL.URBAN_RAIL_CONTROL"}
      - {act: ACT.TRAN.PUBLISH_RAIL_STATUS, owner: "CTRL.URBAN_RAIL_CONTROL"}
      - {act: ACT.TRAN.BUS_BRIDGE_DEPLOY, owner: "CTRL.BUS_SURFACE_CONTROL", when: "rail disruption"}
      - {act: ACT.TRAN.PUBLISH_BUS_STATUS, owner: "CTRL.BUS_SURFACE_CONTROL"}
    stitch:
      - "release gates in pulses; verify platform density before each pulse"
      - "avoid simultaneous release across multiple interchanges"
  PLAYBOOK.TRAN.RAIL_FAULT_CONTAIN_AND_BRIDGE:
    intent: "Localise rail faults; preserve citywide mobility through redundancy."
    truncate:
      - {act: ACT.TRAN.LINE_ISOLATION, owner: "CTRL.URBAN_RAIL_CONTROL"}
      - {act: ACT.TRAN.SERVICE_PATTERN_CHANGE, owner: "CTRL.URBAN_RAIL_CONTROL"}
      - {act: ACT.TRAN.SIGNAL_FAILURE_CONTAIN, owner: "CTRL.MAINLINE_RAIL_CONTROL", when: "mainline fault"}
      - {act: ACT.TRAN.BUS_BRIDGE_DEPLOY, owner: "CTRL.BUS_SURFACE_CONTROL"}
      - {act: ACT.TRAN.PUBLISH_MAINLINE_STATUS, owner: "CTRL.MAINLINE_RAIL_CONTROL"}
    stitch:
      - "restore headways first; only then restore full pattern"
      - "do not re-open closed section until fault cleared + stability window passes"
  PLAYBOOK.TRAN.RED_ROUTE_FLOW_PROTECTION:
    intent: "Keep core roads usable for emergency + freight; prevent gridlock."
    truncate:
      - {act: ACT.TRAN.ROAD_INCIDENT_DIVERSION, owner: "CTRL.ROAD_NETWORK_CONTROL_TFL"}
      - {act: ACT.TRAN.RED_ROUTE_FLOW_CONTROL, owner: "CTRL.ROAD_NETWORK_CONTROL_TFL"}
      - {act: ACT.TRAN.SIGNAL_TIMING_MODE, owner: "CTRL.ROAD_NETWORK_CONTROL_TFL"}
      - {act: ACT.TRAN.WORKS_DESTACK, owner: "CTRL.ROAD_NETWORK_CONTROL_TFL"}
      - {act: ACT.TRAN.PUBLISH_ROAD_STATUS, owner: "CTRL.ROAD_NETWORK_CONTROL_TFL"}
    stitch:
      - "withdraw diversions gradually; watch rebound congestion patches"
  PLAYBOOK.TRAN.AIRPORT_SPILLOVER_ROUTER:
    intent: "Prevent airport disruption from overloading rail/road interchanges."
    truncate:
      - {act: ACT.TRAN.TERMINAL_FLOW_MODE, owner: "CTRL.AIRPORT_OPERATIONS_HEATHROW"}
      - {act: ACT.TRAN.AIRPORT_DISRUPTION_ROUTER, owner: "CTRL.AIRPORT_OPERATIONS_HEATHROW"}
      - {act: ACT.TRAN.SERVICE_PATTERN_CHANGE, owner: "CTRL.URBAN_RAIL_CONTROL", when: "rail access impacted"}
      - {act: ACT.TRAN.RED_ROUTE_FLOW_CONTROL, owner: "CTRL.ROAD_NETWORK_CONTROL_TFL", when: "road access impacted"}
      - {act: ACT.TRAN.PUBLISH_AIRPORT_STATUS, owner: "CTRL.AIRPORT_OPERATIONS_HEATHROW"}
    stitch:
      - "coordinate timed releases (terminal -> station -> road) to avoid surge waves"
  PLAYBOOK.TRAN.EVENT_SURGE_MODE:
    intent: "Manage planned major-event spikes (sport/holidays) without cascade."
    truncate:
      - {act: ACT.TRAN.SERVICE_PATTERN_CHANGE, owner: "CTRL.URBAN_RAIL_CONTROL"}
      - {act: ACT.TRAN.BUS_PRIORITY_MODE, owner: "CTRL.BUS_SURFACE_CONTROL"}
      - {act: ACT.TRAN.WORKS_DESTACK, owner: "CTRL.ROAD_NETWORK_CONTROL_TFL"}
      - {act: ACT.TRAN.STATION_CROWD_CONTROL, owner: "CTRL.URBAN_RAIL_CONTROL"}
    stitch:
      - "step-down in stages; hold extra capacity through rebound window"
# ------------------------------------------------------------
# 20L) Failure mode traces (canonical, non-emotive)
# ------------------------------------------------------------
FAILURE_MODE_TRACE:
  TRACE_SIGNAL_FAULT_TO_CITYWIDE_DELAY:
    chain:
      - "signal fault ->"
      - "line suspension/slow running ->"
      - "interchange crowding ->"
      - "bus bridge overload ->"
      - "road congestion on red routes ->"
      - "emergency movement delays"
    repair:
      - "rail fault contain + bus bridge"
      - "crowd safety truncation"
      - "red route flow protection"
      - "stitch via headway-first restoration"
  TRACE_BRIDGE_TUNNEL_CLOSURE_TO_GRIDLOCK:
    chain:
      - "single-point closure ->"
      - "detours stack onto a few corridors ->"
      - "gridlock patches expand ->"
      - "freight and repairs delayed ->"
      - "cross-lane service recovery slows"
    repair:
      - "diversion routing + junction timing"
      - "works destack"
      - "protect emergency corridors"
  TRACE_AIRPORT_DISRUPTION_TO_INTERCHANGE_OVERLOAD:
    chain:
      - "airport disruption ->"
      - "passenger release wave ->"
      - "rail/road access choke ->"
      - "station crowding + delays ->"
      - "safety escalation"
    repair:
      - "airport spillover router"
      - "timed releases + staged capacity"
# ------------------------------------------------------------
# 20M) Cross-lane couplings (London)
# ------------------------------------------------------------
CROSS_LANE_COUPLINGS:
  TRAN__POWER:
    strength: HIGH
    note: "rail signalling/stations depend on power; power outages create transport cascades"
  TRAN__SAFE:
    strength: HIGH
    note: "crowd control, incident response, evacuation routing"
  TRAN__HEALTH:
    strength: HIGH
    note: "ambulance movement + hospital access; disruption increases risk"
  TRAN__WATER:
    strength: MED
    note: "repair crews and tankers rely on mobility; failures slow water restoration"
  TRAN__WASTE:
    strength: MED
    note: "collection fleets and disposal logistics depend on roads"
  TRAN__DATA:
    strength: HIGH
    note: "status publishing and demand shaping; comms failure multiplies disorder"
  TRAN__FIN:
    strength: HIGH
    note: "lost work time + airport/rail disruption = direct economic loss"
  TRAN__GOV:
    strength: HIGH
    note: "multi-operator coordination; unified comms spine reduces panic and latency"
# ------------------------------------------------------------
# 20N) Expansion rules (toward full London enumeration)
# ------------------------------------------------------------
EXPANSION_RULES:
  R1_INTERCHANGE_DIRECTORY:
    do:
      - "Enumerate major interchanges as Z3 nodes; bind crowding sensors + gate valves."
      - "Tag each interchange with coupling strength (rail↔bus↔road↔river↔airport)."
  R2_CRITICAL_CORRIDOR_LIST:
    do:
      - "Mark red-route critical segments, bridge/tunnel single points, airport access chain nodes."
      - "Bind emergency movement priority edges to SAFE/HEALTH lanes."
  R3_MODE_REDUNDANCY_MAP:
    do:
      - "For each corridor, list nearest redundancy options (alternate lines, bus bridges, diversions)."
      - "Pre-bind bus bridge templates to top failure corridors."
  R4_PLANNED_WORKS_DESTACK:
    do:
      - "Create a works stack index across modes; tripwire if overlapping high-risk windows."
      - "Enforce works gating under event surge mode."
  R5_REALTIME_SENSORIZATION:
    do:
      - "Bind open-data feeds (arrivals, disruptions, road congestion) into S.tran.* sensors."
      - "Add public-trust signal routing: consistent status beats perfect detail."
  R6_EXECUTABILITY_AUDIT:
    do:
      - "For every ACT.*: executor + publisher + pre-auth path must exist (Section 12)."