Kadar svetlobni znak tribarvnega sistema vključuje eno ali več dodatnih zelenih luči z eno ali več puščicami, prižig take dodatne puščice ali puščic, ne glede na to, katera luč sistema tribarvnih svetlobnih znakov v tistem trenutku gori, pomeni, da se lahko vožnja nadaljuje naprej v smer ali smeri, ki jih kaže puščica ali puščice; pomeni pa tudi, da morajo vozniki takrat, ko so njihova vozila na pasu, namenjenem za promet v smer, ki jo kaže puščica, ali v smer, v katero naj bi tak promet potekal, nadaljevati vožnjo v nakazano smer, če bi z ustavitvijo ovirali gibanje vozil za seboj na istem pasu, vendar vedno pod pogojem, da imajo vozila v prometnem toku, v katerega se vključujejo, možnost peljati mimo in da pešci niso ogroženi.
Where a signal of a three-colour system includes one or more additional green lights showing one or more arrows, the lighting of such additional arrow or arrows shall, no matter what phase the three-colour system may be in at the time, mean that traffic may proceed in the direction or directions indicated by the arrow or arrows; it shall also mean that, when vehicles are in a lane reserved for traffic in the direction indicated by the arrow or the direction such traffic is required to take, their drivers must proceed in the direction indicated if by stopping they would obstruct the movement of vehicles behind them in the same lane, provided always that vehicles in the traffic stream they are joining must be allowed to pass and that pedestrians must not be endangered.