My old man once taught me something easily to remember the colour codes by:
If in the old sailing days a ship's captain would ask any of his crew what the colour on the left of the ship was, and no answer was given he would smack them around the cheek. (Taken into account that most people are right handed) The left cheek would turn red and hurt, hence to turn away from it every time and never to forget unless you wanted to get hurt again.