I understand these as. “Expect unexpected shit from me at all times.”

They might be extremly sleep deprived and are forced to drive somewhere regardless (baby sick or something) or might be wrestling with a toddler and a bottle of mistery Liquid he just found somewhere on the backseat. Might also get projectile vomited at right at the moment. Both not ideal driving conditions but sometimes you gotta do shit and be somewhere, even if you really should not drive there yourself.

I take these as a fair warning to be extra alert around these vehicles. Source: have a toddler myself.