The OC says "Drivers should expect younger cyclists to behave unexpected". I don't expect normal cyclists to do 'random' unexpected things. But when I see a 'L'

The OC says "Drivers should expect younger cyclists to behave unexpected". I don't expect normal cyclists to do 'random' unexpected things. But when I see a 'L' board, I am just more aware. This works exactly like street signs asking how to tread with extra care.