This is because that particular Arby's has already done Belichick a solid by setting him up with a reserved parking space (seen in the photo above).
The sign is in reference to Belichick being head coach of the New York Jets for a day after replacing Bill Parcells in 1997. Belichick immediately resigned and of course eventually wound up with the Patriots. As for the binoculars, those are symbolic of the infamous Spygate incident.
Via For the Win