Apparently, the Green Cross Code, with its mantra of 'Stop, look, listen, think', was a bit too hard for 1970s kids to remember. Dolts. Oh hang on, I was one of those.
So to help us dolts out, in 1976, the Green Cross Code recruited Jon Pertwee to teach us all the obviously far easier to remember mantra of 'SPLINK', which stood for (can you guess?) 'Stop at the Pavement, Look and listen, and If traffic is coming, let it pass. When No traffic is near, cross the road, but Keep looking and listening.'
There. Simple hey?