Traffic light system

Red = script.Parent.Red
Green = script.Parent.Green
Yellow = script.Parent.Yellow
on = true

while true do
	Red.Light.Enabled = true
	Red.Transparency = 0
	Yellow.Light.Enabled = false
	Yellow.Transparency = 0.8
	Green.Light.Enabled = false
	Green.Transparency = 0.8
	wait(5)
	Yellow.Light.Enabled = true
	Yellow.Transparency = 0
	Red.Light.Enabled = false
	Red.Transparency = 0.8
	wait(5)
	Green.Light.Enabled = true
	Green.Transparency = 0
	Yellow.Light.Enabled = false
	Yellow.Transparency = 0.8
end