Help with CFrames

[fleet aurora]

local roadParts = SS:WaitForChild("RoadParts")
local partsAmount = 5

for i=1,partsAmount,1 do
    
    -- if i==1 then places the start of the road
    if i==1 then
        start = roadParts.StartFinish.Start:Clone()
        start.Parent = workspace.Road
        start.Name = tostring(i)
        start.Short_Straight.CFrame = CFrame.new(0,1,0)
        continue
    end
    
    -- Takes all the parts available and put them in a table to assign them a number
    parts=roadParts:GetChildren()
    partsArray = {}
    for i=1, #parts, 1 do
        if parts[i]:IsA("Model") then
            table.insert(partsArray, parts[i])
        end
    end
    
    -- Chooses a random road part
    chosenPart = partsArray[math.random(1,#partsArray)]
    -- Clones it and gives it a name
    clone = chosenPart:Clone()
    clone.Parent = workspace.Road
    clone.Name = tostring(i)
    previousRoadPart = workspace.Road:FindFirstChild(tostring(i-1)):FindFirstChildOfClass("MeshPart")
    
    -- Takes the CFrame of the previously spawned road part
    referenceCframe = previousRoadPart.After.WorldCFrame.Position
    
    -- Makes the new road part CFrame the same of the previous one plus the difference between the center and the Before point of the mesh
    newCFrameVector3= referenceCframe + (clone:FindFirstChildOfClass("MeshPart").CFrame.Position - clone:FindFirstChildOfClass("MeshPart").Before.WorldCFrame.Position)    
    
    
    -- Applies the new CFrame
    clone:FindFirstChildOfClass("MeshPart").CFrame = CFrame.new(newCFrameVector3)
    
end```

Just for reference as I know this might be useful, all the pieces of road have this hierarcy where After and Before are 2 Attachments. After is the attachment that tells you where you should be traveling to and the Before attachment is the one that tells you where you came from.