I don’t think that would constitute as littering. Now, tossing a foam coffee cup out on the highway, that would be littering.
True, but law or not, these motorcycle riders need to look out for themselves and not put themselves in harms way because even though the law may protect them if one of them slams into someone’s car door, I myself wouldn’t want to be the one to do that if I was on a bike because bills paid or not, I have this thing about pain and being held up in a hospital bed but that’s just me.