My car keeps breaking whenever cloned?

Citizen = game.Lighting.Car
Citizen1 = game.Lighting.Car1
Citizens = {Citizen, Citizen1}

while wait() do
RCitizen = Citizens[math.random(1, #Citizens)]
RCitizen:Clone().Parent = game.Workspace
RCitizen:MakeJoints() -- doesnt work still
wait(12)
end