What is the standard colour coding and function of the two pneumatic brake lines connecting a tractor to a semi-trailer?

1. Red line is the supply/emergency line (conduite d'alimentation); Yellow line is the service control line (conduite de commande)
2. Red line is for electrical lighting; Yellow line is for air conditioning
3. Red line is for diesel fuel transfer; Yellow line is for engine oil return
4. Red line is for exhaust gas; Yellow line is for drinking water