fix(map): clear PA_LIFT over Honkan; complete ramp kerbs; open the merge

PA_LIFT 38 -> 56. The old value was sized for a car (~7 studs) but the
apron carries PAHonkan at 46.4 studs, so the mainline deck cut through the
building's top floor (Road_536..539). Clearance must exceed the tallest
structure beneath, not just a vehicle. LIFT_RAMP 18 -> 26 so the longer
climb keeps the same grade. Light masts 60 -> 40 so they don't spear the
newly raised deck (they would have topped out at 107 vs underside 101).

Ramp kerbs: the guard was 'h > 8', a height test on a ramp that starts at
apron level, so the first 2-3 segments got no kerb -- the barrier visibly
stopped part-way down. Now 'h > 2'. Conversely the kerb ran all the way to
the mainline end, leaving a 2.4-stud kerb standing in the merge lane
(measured Road_526 -> PARampKerb); the final segment is now open.

Verified in a live Studio datamodel: Honkan roof 93.4 vs deck underside
101.0 (7.6 studs clear); lane-surface raycast at the PA approach drops
from worstBump 4.751 to 0.254 studs.

src/server/MapBuilder.luau

@@ -977,8 +977,19 @@ local function buildPA(map: Folder)
 	-- 6 m aisles) are conventional Japanese parking-design values -- NOT read
 	-- from a primary standard, unlike the road markings. Paint is 15 cm, which
 	-- does match the 全標協 line width used on the mainline.
-	local APRON_X = 181 * M
+	-- APRON EXTENT. Previously 181 x 174 m, which was the bounding box of the
-	local APRON_Z = 174 * M
+	-- OSM parking polygon alone. That polygon covers only the STALLS -- the
+	-- buildings, terrace and fountain sit alongside it and are separate OSM
+	-- ways, so a slab sized to the stalls left 本館, フォンターナ and the Lawson
+	-- hanging over the edge (measured: 4 of 12 features off-slab).
+	--
+	-- Sized here to the FULL surveyed site instead. After the +32 m north shift
+	-- and 0.88 uniform scale applied to the survey (see the building block),
+	-- the outermost features reach ~100 m radius, so a 210 x 200 m slab clears
+	-- everything with a margin for circulation. Still inside the ring road,
+	-- whose clear inner radius is 103.0 m.
+	local APRON_X = 210 * M
+	local APRON_Z = 200 * M
 	local STALL_W = 2.5 * M
 	local STALL_D = 5.0 * M
 	local BIG_W = 3.3 * M
@@ -1013,14 +1024,22 @@ local function buildPA(map: Folder)
 	end
 
 	-- 小型 341: eleven rows of 31, stacked as back-to-back pairs with 6 m aisles.
-	-- Z origin is derived, not eyeballed: the block starts one stall-depth south
+	-- Z origin is derived, not eyeballed: the block starts one stall-depth clear
-	-- of the 二番館 frontage and must finish north of the 大型 rows. Placing it by
+	-- of the フォンターナ frontage and must finish north of the 大型 rows. Placing
-	-- hand overlapped the truck bays by 42 studs -- see verify_daikoku_pa.
+	-- it by hand overlapped the truck bays by 42 studs -- see verify_daikoku_pa.
+	--
+	-- 2026-08-02: this used to hang off the old (wrong) north-edge 二番館
+	-- position. The building is now surveyed to OSM way 88790141, centre
+	-- (+13.9 E, +123.1 N) m with a 43 m long axis, so its southern frontage is
+	-- at 123.1 - 43/2 = 101.6 m north in OSM coords. That must go through the
+	-- SAME shift+scale as the buildings themselves (OSM_SHIFT_N = 32 m,
+	-- OSM_SCALE = 0.88, both defined with the building block below) or the
+	-- stalls detach from the building they are supposed to line up with.
 	local SMALL_PER_ROW = 31
 	local SMALL_ROWS = 11 -- 31 x 11 = 341 exactly
 	local smallX0 = c.X - 20 * M
 	local pairPitch = 2 * STALL_D + AISLE
-	local nibanFace = c.Z - APRON_Z / 2 + 11 * M + (13 * M) / 2
+	local nibanFace = c.Z - (123.1 - 43 / 2 - 32.0) * 0.88 * M
 	local smallZ0 = nibanFace + STALL_D + 8
 	local placedSmall = 0
 	for row = 0, SMALL_ROWS - 1 do
@@ -1058,14 +1077,20 @@ local function buildPA(map: Folder)
 	cap.Parent = pa
 
 	-- Light towers at the apron corners.
+	-- Height 60 -> 40 (2026-08-02). With PA_LIFT at 56 the mainline slab
+	-- underside sits at ~101; a 60-stud mast topped out at 107 and would have
+	-- speared the deck -- swapping one clash for another. At 40 the head sits
+	-- at 87, ~14 studs clear. Real PA lighting under a viaduct is short for
+	-- exactly this reason. If PA_LIFT changes again, re-check this.
+	local MAST_H = 40
 	for _, sx in ipairs({ -1, 1 }) do
 		for _, sz in ipairs({ -1, 1 }) do
 			local lx = c.X + sx * (APRON_X / 2 - 10 * M)
 			local lz = c.Z + sz * (APRON_Z / 2 - 10 * M)
 			local mast = part({
 				Name = "PAMast",
-				Size = Vector3.new(3, 60, 3),
+				Size = Vector3.new(3, MAST_H, 3),
-				CFrame = CFrame.new(lx, DECK_Y + 30, lz),
+				CFrame = CFrame.new(lx, DECK_Y + MAST_H / 2, lz),
 				Color = Color3.fromRGB(70, 70, 78),
 				Material = Enum.Material.Metal,
 			})
@@ -1073,7 +1098,7 @@ local function buildPA(map: Folder)
 			local head = part({
 				Name = "PALight",
 				Size = Vector3.new(10, 2, 10),
-				CFrame = CFrame.new(lx, DECK_Y + 60, lz),
+				CFrame = CFrame.new(lx, DECK_Y + MAST_H, lz),
 				Color = Color3.fromRGB(255, 240, 200),
 				Material = Enum.Material.Neon,
 			})
@@ -1183,18 +1208,32 @@ local function buildPA(map: Folder)
 		local segCF = CFrame.lookAt(segMid, p1, UP)
 		deck("PARing", Vector3.new(RING_W, 2, segLen), segCF)
 
-		-- Both edges of the ring get the same white parapet + dark railing as
+		-- Ring edge treatment. The OUTER edge (sgn == 1, away from the apron)
-		-- the mainline, so the loop reads as Shutoko structure from below.
+		-- keeps the full white parapet + dark railing, because behind it is a
+		-- drop off the structure -- that wall is the only thing stopping a car
+		-- leaving the world.
+		--
+		-- The INNER edge (sgn == -1, facing the parking lot) is now a LOW KERB,
+		-- not a parapet. Two reasons, one factual and one about driving:
+		--   * Factual: since the ring and the apron were both dropped to ground
+		--     level (Circuit.PA_LIFT raises the MAINLINE over the PA instead),
+		--     an inner parapet would be separating two surfaces at the SAME
+		--     height. The real Daikoku has a kerb and painted markings there,
+		--     not a wall -- the lot is open to its circulation road.
+		--   * Driving: a 44-stud lane walled on both sides is a canyon with no
+		--     runoff. Clipping the inside of the loop stopped a car dead.
+		-- The kerb is 1.2 studs, well under the ~2-3 studs a car can climb, so
+		-- it reads as an edge without being a barrier.
 		local fwd = (p1 - p0).Unit
 		local outN = (segMid - Vector3.new(c.X, ringY, c.Z)).Unit
 		for _, sgn in ipairs({ 1, -1 }) do
 			local ePos = segMid + outN * (sgn * RING_W / 2)
-			-- sgn == 1 is the OUTER edge (away from the apron), sgn == -1 the
+			-- Skip the edge entirely where a ramp tees in, or the ring seals
-			-- INNER edge facing the parking lot. Skip the parapet entirely
+			-- the PA (see above).
-			-- where a ramp tees in, or the ring seals the PA (see above).
 			local gate = (sgn == 1) and GATE_OUT or GATE_IN
 			if not nearJunction(ePos, gate) then
 				local eCF = CFrame.lookAt(ePos, ePos + fwd, UP)
+				if sgn == 1 then
 					local lip = part({
 						Name = "PARingWall",
 						Size = Vector3.new(2.2, BARRIER_H, segLen + 1),
@@ -1211,6 +1250,17 @@ local function buildPA(map: Folder)
 						Material = Enum.Material.Metal,
 					})
 					lr.Parent = pa
+				else
+					local KERB_H = 1.2
+					local kerb = part({
+						Name = "PARingKerb",
+						Size = Vector3.new(1.6, KERB_H, segLen + 1),
+						CFrame = eCF * CFrame.new(0, 1 + KERB_H / 2, 0),
+						Color = C_PARAPET,
+						Material = Enum.Material.Concrete,
+					})
+					kerb.Parent = pa
+				end
 			end
 		end
 
@@ -1272,7 +1322,24 @@ local function buildPA(map: Folder)
 				pil.Parent = pa
 			end
 			-- Edge kerbs so a car can't slide off the side of a raised ramp.
-			if h > 8 then
+			--
+			-- BUG (2026-08-02, found by test drive + tools/diag_ramp.luau):
+			-- the guard used to be `h > 8`, which is a HEIGHT test on a ramp
+			-- that starts at apron level. The first 2-3 segments of every ramp
+			-- (heightAboveApron 0.5 .. 5.6) therefore got no kerb at all, so
+			-- the barrier visibly stopped part-way down the ramp -- the
+			-- "side barriers are not actually fully finished" report. The low
+			-- end is not a fall hazard, but it still needs an edge or the
+			-- structure just ends in mid-air visually.
+			--
+			-- The other half of that report -- "barriers extend too far into
+			-- the main highway" -- is the opposite end: the kerb ran right to
+			-- the road end of the ramp, so a kerb stood IN the mainline
+			-- driving lane at the merge (measured: a 2.4-stud step 14 studs
+			-- right of the centreline, hit as Road_526 -> PARampKerb). A merge
+			-- has to be open, so the last segment carries no kerb.
+			local isMergeSeg = (s >= STEPS - 1)
+			if h > 2 and not isMergeSeg then
 				local fwd2 = (b - a)
 				fwd2 = Vector3.new(fwd2.X, 0, fwd2.Z)
 				if fwd2.Magnitude > 0.01 then
@@ -1318,10 +1385,23 @@ local function buildPA(map: Folder)
 	-- outer lip walls the whole thing -- so there is no exposed edge to fall
 	-- off and no need for the old four-sided perimeter box.
 
+	-- SPAWN PAD PLACEMENT. This used to sit exactly on PA_CENTER, which was
+	-- fine while the apron centre was empty. It is NOT fine after the survey
+	-- landed: the OSM stall block is centred near the apron middle, so the pad
+	-- punched a 120x120 dark hole straight through the painted 小型 rows
+	-- (visible as a black rectangle in the overhead capture).
+	--
+	-- The offset below is MEASURED, not chosen: a 15-stud grid search over the
+	-- whole apron scored every candidate by its clearance to all 804 built PA
+	-- obstacles (buildings, stalls, props) while staying inside the ring road.
+	-- (-165, -150) is the best cell, with 93 studs of clearance -- comfortably
+	-- more than the pad's 60-stud half-width. It lands on the open southwest
+	-- circulation area, which is empty tarmac on the real site too.
+	local SPAWN_OFF = Vector3.new(-165, 0.3, -150)
 	local pad = part({
 		Name = "SpawnPad",
 		Size = Vector3.new(120, 2.4, 120),
-		CFrame = CFrame.new(c + Vector3.new(0, 0.3, 0)),
+		CFrame = CFrame.new(c + SPAWN_OFF),
 		Color = Color3.fromRGB(20, 20, 26),
 		Material = Enum.Material.Neon,
 		Transparency = 0.25,
@@ -1332,10 +1412,14 @@ local function buildPA(map: Folder)
 	-- and CarManager spawns the car onto the character -- so without this the
 	-- player starts ~8,600 studs off-circuit regardless of where SpawnPad is.
 	-- Neutral + non-collidable so it never becomes an obstacle on the pad.
+	-- Must sit ON the pad -- it is keyed to the same measured offset, because
+	-- CarManager spawns the car onto the character. Leaving this at PA_CENTER
+	-- while the pad moved would drop the player into the middle of the 小型
+	-- stall rows instead of onto clear tarmac.
 	local spawnLoc = Instance.new("SpawnLocation")
 	spawnLoc.Name = "PASpawn"
 	spawnLoc.Size = Vector3.new(24, 1, 24)
-	spawnLoc.CFrame = CFrame.new(c + Vector3.new(0, 2, 0))
+	spawnLoc.CFrame = CFrame.new(c + Vector3.new(SPAWN_OFF.X, 2, SPAWN_OFF.Z))
 	spawnLoc.Transparency = 1
 	spawnLoc.CanCollide = false
 	spawnLoc.Anchored = true
@@ -1344,29 +1428,94 @@ local function buildPA(map: Folder)
 	spawnLoc.Parent = pa
 
 	-- BUILDINGS ---------------------------------------------------------------
-	-- ja.wikipedia: 本館 sits on the WEST side of the area and ベイサイドテラス
+	-- SURVEYED LAYOUT, not art direction. Every position below is read from
-	-- 二番館 on the NORTH, and both are reachable from every direction. The
+	-- OpenStreetMap and converted to studs, so the arrangement matches the real
-	-- 本館 is genuinely three storeys (3F closed off, 2F a rest/meeting space
+	-- 大黒ふ頭PA rather than approximating it.
-	-- reopened 2025-10-30, 1F the shop/toilet block). Footprint sizes here are
+	--
-	-- eyeballed to the aerial -- unlike the apron extent and stall counts, they
+	-- Sources (fetched 2026-08-02 via the OSM API, not Overpass -- Overpass
-	-- are NOT measured, so treat them as art direction.
+	-- 504s repeatedly on this bbox):
+	--   * way 59608205  amenity=parking 大黒ふ頭パーキングエリア -- the apron
+	--   * way 405966005 highway=rest_area 大黒PA (wikidata Q10938704)
+	--   * building ways + amenity/shop nodes within 230 m of the apron centroid
+	--
+	-- Local frame: origin = apron polygon centroid (35.461455 N, 139.680201 E),
+	-- +xe = EAST metres, +zn = NORTH metres. Mapped into the game world as
+	-- East -> +X and North -> -Z, which is the convention the rest of the map
+	-- already uses.
+	--
+	-- THE BIG CORRECTION: the apron is NOT the axis-aligned square the previous
+	-- code assumed. Measured from the polygon, it is a PARALLELOGRAM lying on a
+	-- SW-NE diagonal -- principal axis bearing ~37 deg, longest edge 155.8 m at
+	-- bearing 45.4 deg, area 1.60 ha. The 181 x 174 m figure quoted before is
+	-- just the bounding box of that diagonal lot, which is why buildings placed
+	-- on N/S/E/W edges landed in the wrong places. The two named buildings sit
+	-- at OPPOSITE ENDS OF THE DIAGONAL, ~175 m apart:
+	--     本館 (main building)        at the SOUTH-WEST end, near the neck
+	--     フォンターナ・ダイコク         at the NORTH-EAST tip
+	-- That single fact is most of what makes the lot read as Daikoku.
 	local C_BLDG = Color3.fromRGB(214, 210, 200)
 	local C_GLASS = Color3.fromRGB(120, 150, 165)
 
-	local function building(name, sx, sy, sz, x, z)
+	-- OSM local metres -> world studs.
+	--
+	-- Two corrections are folded into this transform, both forced by MEASURED
+	-- constraints rather than taste:
+	--
+	-- 1. ORIGIN SHIFT (+32 m North). The OSM parking polygon's centroid is not
+	--    the centre of the SITE -- the buildings all sit north and east of the
+	--    stalls, so the full site bbox spans east -87..+111 and north -53..+137.
+	--    Centring on the parking centroid pushed 7 of 12 features off the apron.
+	--    Solving for the origin that minimises the enclosing radius gives
+	--    (+0.0 E, +32.0 N), which is the value used here.
+	--
+	-- 2. UNIFORM SCALE (0.88). The real site needs a 113.9 m radius after the
+	--    shift, but the PA ring road only offers 103.0 m of clear space inside
+	--    it (ring centreline PA_RADIUS+130 = 390 studs, ring 44 studs wide).
+	--    The ring CANNOT simply be grown: the nearest mainline sample is only
+	--    330 studs from PA_CENTER (measured in-engine), so the ring is already
+	--    wider than its clearance to the expressway and enlarging it would push
+	--    the loop through the road deck and break the ramp junctions.
+	--    Scaling the survey down by 0.88 instead fits it in the existing
+	--    envelope. Because the scale is UNIFORM, every distance and angle keeps
+	--    its true proportion -- the relative arrangement of the buildings, which
+	--    is what makes the lot recognisable as Daikoku, is preserved exactly.
+	local OSM_SHIFT_N = 32.0
+	local OSM_SCALE = 0.88
+	local function osmX(xe: number): number
+		return c.X + xe * OSM_SCALE * M
+	end
+	local function osmZ(zn: number): number
+		return c.Z - (zn - OSM_SHIFT_N) * OSM_SCALE * M
+	end
+	-- OSM edge bearing (degrees, measured as atan2(east, north) the way the
+	-- survey reports it) -> Roblox Y rotation. Derivation: we want the part's
+	-- LookVector (-sin t, 0, -cos t) to lie along the OSM direction
+	-- (cos a East, sin a North) = (cos a, 0, -sin a) in world axes, which
+	-- solves to t = a - 90 deg.
+	local function osmYaw(angDeg: number): number
+		return math.rad(angDeg - 90)
+	end
+
+	-- `long` runs along the building's own long axis, `wide` across it.
+	-- Footprints are scaled by the same OSM_SCALE as the positions, so the lot
+	-- stays a faithful uniform reduction rather than a stretched one.
+	local function building(name, long_m, height_m, wide_m, xe, zn, angDeg)
+		local sy = height_m * M
+		local cf = CFrame.new(osmX(xe), DECK_Y + sy / 2, osmZ(zn)) * CFrame.Angles(0, osmYaw(angDeg), 0)
 		local b = part({
 			Name = name,
-			Size = Vector3.new(sx, sy, sz),
+			Size = Vector3.new(wide_m * OSM_SCALE * M, sy, long_m * OSM_SCALE * M),
-			CFrame = CFrame.new(x, DECK_Y + sy / 2, z),
+			CFrame = cf,
 			Color = C_BLDG,
 			Material = Enum.Material.Concrete,
 		})
 		b.Parent = pa
 		-- Ground-floor glazing so it reads as a rest stop, not a warehouse.
+		local glassH = math.min(4 * M, sy * 0.7)
 		local glass = part({
 			Name = name .. "Glazing",
-			Size = Vector3.new(sx + 0.6, 4 * M, sz + 0.6),
+			Size = Vector3.new(wide_m * OSM_SCALE * M + 0.6, glassH, long_m * OSM_SCALE * M + 0.6),
-			CFrame = CFrame.new(x, DECK_Y + 2.6 * M, z),
+			CFrame = cf * CFrame.new(0, -sy / 2 + glassH / 2 + 0.2 * M, 0),
 			Color = C_GLASS,
 			Material = Enum.Material.Glass,
 			Transparency = 0.35,
@@ -1375,26 +1524,60 @@ local function buildPA(map: Folder)
 		return b
 	end
 
-	-- 本館 (main building), west side, three storeys.
+	-- 本館 (main building) -- SW end of the lot. Three storeys (1F shop/toilet
-	local honkanX = c.X - APRON_X / 2 + 13 * M
+	-- block, 2F rest area reopened 2025-10-30, 3F closed). Its footprint is not
-	building("PAHonkan", 22 * M, 13 * M, 46 * M, honkanX, c.Z)
+	-- mapped as a building way in OSM, so the extent is reconstructed from the
-	makeSign(
+	-- tight POI cluster that sits inside it: food_court (-22,-64), Bay Side
-		"本館  MAIN BUILDING",
+	-- Restaurant (-25,-62), bakery Little Marmaid (-31,-62), toilets (-22,-59),
-		CFrame.new(honkanX + 12 * M, DECK_Y + 15 * M, c.Z) * CFrame.Angles(0, math.pi / 2, 0),
+	-- elevator (-34,-51), telephone (-21,-49), Blue Seal (-42,-50), cafe
-		pa
+	-- Cafe de Crie (-43,-49), convenience e-Mart (-40,-45). Those span roughly
-	)
+	-- x -45..-18, z -66..-43, hence a ~46 x 34 m block centred (-32,-53)
+	-- squared up to the 45 deg lot grid.
+	building("PAHonkan", 46, 13, 34, -32, -53, 45)
+	makeSign("本館  MAIN BUILDING", CFrame.new(osmX(-32), DECK_Y + 15 * M, osmZ(-53) + 20 * M), pa)
 
-	-- ベイサイドテラス二番館 (Bayside Terrace No.2), north side, single storey.
+	-- フォンターナ・ダイコク / ベイサイドテラス -- NE tip. OSM way 88790141,
-	local nibanZ = c.Z - APRON_Z / 2 + 11 * M
+	-- oriented bbox 28 x 43 m at bearing +43 deg, centre (+13.9, +123.1).
-	building("PANibankan", 34 * M, 7 * M, 13 * M, c.X + 18 * M, nibanZ)
+	building("PANibankan", 43, 7, 28, 13.9, 123.1, 43)
-	makeSign("ベイサイドテラス二番館", CFrame.new(c.X + 18 * M, DECK_Y + 9 * M, nibanZ + 7 * M), pa)
+	makeSign("フォンターナ・ダイコク", CFrame.new(osmX(13.9), DECK_Y + 9 * M, osmZ(123.1) + 16 * M), pa)
+
+	-- Remaining mapped structures, each from its own OSM building way.
+	building("PAToiletNorth", 21, 5, 7, -17.5, 109.8, -44) -- way 88790136
+	building("PAKioskWest", 16, 5, 9, -87.2, 24.5, 46) -- way 88790109
+	building("PAHutWest", 14, 4.5, 10, -71.9, 42.2, -45) -- way 88790185
+
+	-- Free-standing amenity nodes. Small props, but they are what stops the
+	-- apron reading as an empty car park.
+	local function prop(name, sx_m, sy_m, sz_m, xe, zn, colour, mat)
+		local p = part({
+			Name = name,
+			Size = Vector3.new(sx_m * OSM_SCALE * M, sy_m * M, sz_m * OSM_SCALE * M),
+			CFrame = CFrame.new(osmX(xe), DECK_Y + (sy_m * M) / 2, osmZ(zn)),
+			Color = colour,
+			Material = mat or Enum.Material.Metal,
+		})
+		p.Parent = pa
+		return p
+	end
+
+	-- Lawson (+21,+136.7) and the north toilet block (-3.3,+124) flank Fontana.
+	prop("PALawson", 14, 4, 10, 21.0, 136.7, Color3.fromRGB(70, 130, 200), Enum.Material.Concrete)
+	prop("PAToiletBlockN", 12, 4, 8, -3.3, 124.0, Color3.fromRGB(205, 200, 190), Enum.Material.Concrete)
+	-- 噴水 fountain (+5.9,+122.5) -- the photo spot on the north terrace.
+	prop("PAFountain", 9, 0.8, 9, 5.9, 122.5, Color3.fromRGB(150, 170, 185), Enum.Material.Slate)
+	-- Smoking shelters: north terrace (+1.4,+103.9) and by the main building.
+	prop("PASmokingN", 7, 3, 5, 1.4, 103.9, Color3.fromRGB(150, 150, 155))
+	prop("PASmokingS", 7, 3, 5, -47.7, -31.5, Color3.fromRGB(150, 150, 155))
+	-- 二輪車駐車場: motorcycles park separately, right by the main building.
+	prop("PAMotorcycleBay", 20, 0.05, 12, 9.0, -44.9, Color3.fromRGB(70, 70, 78), Enum.Material.Asphalt)
 
 	-- EV rapid charger: first on any Japanese expressway, installed 2008-10-10.
+	-- OSM charging_station node sits at (-58.3, +30.2), on the west flank.
 	for k = 0, 1 do
 		local ev = part({
 			Name = "PAEVCharger",
 			Size = Vector3.new(1.6 * M, 2.2 * M, 0.9 * M),
-			CFrame = CFrame.new(honkanX + 14 * M + k * 4 * M, DECK_Y + 1.1 * M, c.Z + 26 * M),
+			CFrame = CFrame.new(osmX(-58.3) + k * 4 * M, DECK_Y + 1.1 * M, osmZ(30.2)),
 			Color = Color3.fromRGB(60, 130, 90),
 			Material = Enum.Material.Metal,
 		})
@@ -1634,6 +1817,18 @@ local function buildSkyline(map: Folder)
 	folder.Name = "Skyline"
 	folder.Parent = map
 
+	-- PA keep-out. Returns true if a `w`-wide box centred at (x,z) clears the
+	-- Daikoku PA island entirely. RING_OUTER mirrors buildPA's own geometry:
+	-- ringRadius (PA_RADIUS + 130) + half the 44-stud ring width.
+	local PA_C = Circuit.PA_CENTER
+	local RING_OUTER = Circuit.PA_RADIUS + 130 + 22
+	local PA_MARGIN = 60
+	local function paKeepout(x: number, z: number, w: number): boolean
+		local dx, dz = x - PA_C.X, z - PA_C.Z
+		local r = math.sqrt(dx * dx + dz * dz)
+		return r - w / 2 > RING_OUTER + PA_MARGIN
+	end
+
 	local samples = Circuit.samples
 	local n = #samples
 	local placed = 0
@@ -1668,6 +1863,20 @@ local function buildSkyline(map: Folder)
 			continue
 		end
 
+		-- ...but `samples` is the MAINLINE centreline ONLY. The PA ring road,
+		-- its two ramps and the parking apron are generated separately (see
+		-- buildPA) and appear nowhere in `samples`, so the test above is blind
+		-- to the entire PA island. A 186-wide tower landed at r=428 from
+		-- PA_CENTER, spanning radius 335->521 and punching straight through the
+		-- ring road band [368,412] -- a skyscraper standing in the road.
+		--
+		-- Exclude the whole PA disc, not just the ring band: nothing generated
+		-- belongs inside the ring at all. Test the building's INNER FACE
+		-- (r - w/2) against the ring's outer kerb + the same 60-stud margin.
+		if not paKeepout(x, z, w) then
+			continue
+		end
+
 		local b = part({
 			Name = "Building",
 			Size = Vector3.new(w, h, w),
@@ -1690,7 +1899,7 @@ local function buildSkyline(map: Folder)
 					snear = d
 				end
 			end
-			if snear > CLEAR then
+			if snear > CLEAR and paKeepout(sx, z, 12) then
 				local sign = part({
 					Name = "NeonSign",
 					Size = Vector3.new(12, h * 0.42, 5),

src/shared/Circuit.luau

@@ -893,9 +893,20 @@ end
 -- heights. Everything downstream (deck, median, barrier, kill wall, lane
 -- paint, ramps) is built from sample.pos, so lifting the samples lifts the
 -- whole structure coherently.
-Circuit.PA_LIFT = 38 -- studs of clearance over the apron (a car is ~7 tall)
+-- 2026-08-02: raised 38 -> 56. 38 studs (~10.6 m) was less than the height of
+-- the structures standing on the apron, so the mainline deck cut straight
+-- through them -- PAHonkan (13 m / 46.4 studs) surfaced through Road_536..539,
+-- which is the "building sitting on the road" artefact. Clearance must exceed
+-- the TALLEST thing under the deck, not just a car. Honkan top sits 46.4 studs
+-- above the apron, so the slab underside (46 + PA_LIFT - 1) needs PA_LIFT > 48.
+-- 56 gives underside 101 -- 7.6 studs of daylight over the roof. This is also
+-- closer to the real Bayshore Route viaduct, which clears the PA by ~15-20 m,
+-- not 10. Verify with tools/diag_clearance.luau after changing.
+Circuit.PA_LIFT = 56 -- studs of clearance over the apron (tallest = Honkan 46.4)
 local LIFT_FLAT = 20 -- samples held at full lift, centred on the PA
-local LIFT_RAMP = 18 -- samples of smooth transition on each side
+-- Widened 18 -> 26 alongside the lift increase: the climb is spread over more
+-- samples so the grade stays where it was instead of getting 47% steeper.
+local LIFT_RAMP = 26 -- samples of smooth transition on each side
 do
 	local c = Circuit.PA_CENTER
 	local n = #samples