-- The 10 flagged samples all read barrier=22.9 -- the exact signature of the
-- RELOCATED parapet (aux lane still exists at 510..524 and 551..565, and its
-- outer edge carries the rail). probe_final's audit did not re-probe the aux
-- outer edge, so it mislabelled them. Settle it: for each flagged sample,
-- measure distance from the AUX OUTER edge to the nearest barrier.
local out = {}
local function say(s) table.insert(out, s) end

local map = workspace:FindFirstChild("Map")
if not map then return "Map MISSING" end

local deck, bars, aux = {}, {}, {}
for _, d in ipairs(map:GetDescendants()) do
	if d:IsA("BasePart") then
		local k = d.Name:match("^Road_(%d+)$") or d.Name:match("^Deck_(%d+)$")
		if k then deck[tonumber(k)] = d end
		if d.Name == "Barrier" or d.Name == "EdgeRail" then table.insert(bars, d) end
		local a = d.Name:match("^AuxLane_(%d+)$")
		if a then aux[tonumber(a)] = d end
	end
end

local UP = Vector3.new(0, 1, 0)
local function flat(v) return Vector3.new(v.X, 0, v.Z) end
local function nearest(p, ytol)
	local best = math.huge
	for _, b in ipairs(bars) do
		if math.abs(b.Position.Y - p.Y) < (ytol or 14) then
			local dd = (flat(b.Position) - flat(p)).Magnitude
			if dd < best then best = dd end
		end
	end
	return best
end

local flagged = { 520, 521, 522, 523, 524, 551, 552, 553, 554, 555 }
local trueHoles = {}
say("sample | auxHere | barrier@auxOuterEdge | verdict")
for _, i in ipairs(flagged) do
	local d, a = deck[i], aux[i]
	if d then
		local right = d.CFrame.LookVector:Cross(UP).Unit
		local verdict, dist
		if a then
			-- probe just outboard of the AUX lane, where the rail was moved to
			local outer = a.Position - right * (a.Size.X / 2 + 2)
			dist = nearest(outer)
			verdict = dist < 14 and "OK (parapet relocated to aux edge)" or "HOLE"
		else
			local edge = d.Position - right * (d.Size.X / 2 + 2)
			dist = nearest(edge)
			verdict = dist < 12 and "OK" or "HOLE"
		end
		if verdict == "HOLE" then table.insert(trueHoles, i) end
		say(("  %d | aux=%s | %.1f | %s"):format(i, a and "yes" or "no", dist, verdict))
	end
end

say(("TRUE UNGUARDED SAMPLES: %d %s"):format(#trueHoles,
	#trueHoles > 0 and table.concat(trueHoles, ",") or "(none)"))

-- Full-loop sweep so nothing elsewhere is missed.
local swept, holes = 0, {}
for i, d in pairs(deck) do
	swept += 1
	local right = d.CFrame.LookVector:Cross(UP).Unit
	for _, sgn in ipairs({ -1, 1 }) do
		local edge = d.Position + right * sgn * (d.Size.X / 2 + 2)
		if nearest(edge) >= 12 then
			local a = aux[i]
			local ok = false
			if a then
				local outer = a.Position + right * sgn * (a.Size.X / 2 + 2)
				if nearest(outer) < 14 then ok = true end
			end
			if not ok then
				-- ramp mouth? slip structure nearby counts as guarded
				local sd = math.huge
				for _, p in ipairs(map:GetDescendants()) do
					if p:IsA("BasePart") and p.Name:match("Slip") then
						local dd = (flat(p.Position) - flat(edge)).Magnitude
						if dd < sd then sd = dd end
					end
				end
				if sd > 30 then table.insert(holes, i .. (sgn < 0 and "L" or "R")) end
			end
		end
	end
end
say(("FULL SWEEP: %d deck samples, unguarded=%d %s"):format(swept, #holes,
	#holes > 0 and ("-> " .. table.concat(holes, ",")) or "(none)"))

return table.concat(out, "\n")