Cars don't tween correctly?

Local script in PlayerGui

--Settings:
 tweenService = game:GetService("TweenService")
 tweenTime = 4 --default speed 
 easingStyle = Enum.EasingStyle.Linear
 easingDirection = Enum.EasingDirection.InOut
 repeats = math.huge --How many times to repeat the tween (math.huge is the same as infinite)
 reverse = false --Also go in reverse if u want lol
 delayTime = 0 --Delay between each tween if tween repeats


--[[How to use the car system

    1. Replace the Car mesh with the new model mesh.
    2. Under the car mesh place Motor6D weld, primary part 0 for the car mesh, primary part 1 to the hitbox
    3. Move "Goal" to where you want the car to stop driving.   

--]]



--Car

for i,v in pairs (workspace:GetDescendants()) do
    if v.Name == 'Car' then
         model = v
        goalPart = v:WaitForChild("GoalPart")
        if v:FindFirstChild("Speed") then
            tweenTime = v.Speed.Value
        end
        info = TweenInfo.new(tweenTime, easingStyle, easingDirection, repeats, reverse, delayTime)
        local function tweenModel(model, CF)
            local CFrameValue = Instance.new("CFrameValue")
            CFrameValue.Value = model:GetPrimaryPartCFrame()

            CFrameValue:GetPropertyChangedSignal("Value"):Connect(function()
                model:SetPrimaryPartCFrame(CFrameValue.Value)
            end)

            local tween = tweenService:Create(CFrameValue, info, {Value = CF})
            tween:Play()

            tween.Completed:Connect(function()
                CFrameValue:Destroy()
            end)
        end

        local success, message = pcall(function()
            tweenModel(model, goalPart.Value.CFrame)
        end)

        if not success then
            print(message)
        end
    end
end

What happens is I set the speed value for one car and the speed for every other car changes even it doesn't even go the default speed.

https://gyazo.com/b3a3533224294e1e805c76ac8fab03a1

Link of the speed values