"Deer X-ing" signs are for humans

You know those highway signs that say "Deer X-ing" (deer crossing)?   Well, it seems that someone tried to use this as a defense in a court case involving a car killing a deer that was crossing the road 'in an unauthorized place.'  So the authorities had to clarify with this statement:

"'Deer X-ing' signs are for humans to read.  Signs are not put up to tell the deer where to cross, because deer cannot read signs.   They are put up to tell human drivers where deer tend to cross and to watch out so as not to hit them."

Duh!   Nice try, somebody's lawyer.