The Capital District is Illiterate

I spend the better part of my days at work standing in the store's vestibule and watching traffic go up and down Hoosick St.

There's this one CDTA bus, (I think its the 87) that goes up and down Hoosick St, and when it is traveling eastward, the destination sign on the front of the bus says; "Walmart's"

Yes, "Walmart's"

First of all, the store is called Wal-Mart. Secondly, the bus is not owned by Wal-Mart, so why is there and apostrophe?

I swear to Hosanna in the Highest that this bus exists. What angers me is that I don't think people who live around here even notice that their busses are grammatically incorrect.