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