I understand it might offend some, but I have to say, they didn't just spray-paint a huge penis on there, which is always expected and received with an annoyed groan. Everyone agrees, and has the same general thought "Come on, couldn't you have just drawn it on a bathroom stall, for goodness sake?"
But can you picture the responses for this one?
WIFE:"Honey, is there a rest area ahead (seeing the sign from far off) where we can pull off?"
HUSBAND:"Hmm...don't know (squinting) there might be..."
WIFE:"What the Hell?..."
HUSBAND:(uncertainly) "Well, I'm sure they have a bathroom..." (smirks)
HUSBAND:"Honey, look, there is probably some kind of new ordinance that allows them to have a logo like a gas pump or a bed...or maybe both (snickering)"
WIFE:"UUGH! (muffled sound of thudding fists)"
HUSBAND:"Aw c'mon, guys are people too! Just like they have a sign up there for rest, and food, why can't guys expect...(obscured by the sound of thudding fists)"