Most areas don't allow them, they are afraid you will dump oil down them.
We had to hide the one in my friends garage with a skim coat of cement for inspection, then open it up latter.
Hmm, I always thought the garage drain was a great idea. Heck, I want my laundry room and every bathroom to have one.
My grandpa rigged a shower over his garage drain, so when he'd come home form work all dusty or muddy, he could shower off before stepping inside. A mite chilly in Iowa in the winter, though.
