Bugs in America is often used to mean any creepy crawly, but it refers also to a group of insects with piercing and sucking mouthparts (Hemiptera).Still beat ya; I pull over and run around picking them all up. I don't get every single one, but I get as many as I can then keep going when cars start coming.
So you found the one category I won't play chicken in traffic for; bugs and Isopoda (that's what worms snails and slugs are, right?)
Isopoda includes the pill bugs / woodlice.
Worms are lots of different phyla, but earthworms are Annelids.
Snails and slugs are gastropod molluscs.