As we know from experience trying to use computers, humans struggle to remember a series of words, letters and numbers - like these runway instructions. When we

As we know from experience trying to use computers, humans struggle to remember a series of words, letters and numbers - like these runway instructions. When we are tired or stressed we'll make mistakes. This is true even for highly trained pilots. We need some additional safety methods like the lights. I imagine the pilot writes it down and tries to follow it. But it's a dynamic env, it might be raining, bright, or dark, planes comes and going. You might not remember the details of this runway. That's my naive view as an outsider. Eventually this system will fail (remembering and following) and lead to crash. I never thought about it but it seems inherently risky to have people "remember directions".