The ads you place, the bulletin board announcements you post, and the signs you put up will bring many people to your garage sale location. A lot of people will drive by slowly and just look, but most will stop to browse around. But you still have to contend with the huge number of people who just drive by without stopping. You must call attention to your sale. Don't be shy, bashful or self-conscious about letting everybody for miles around know that you're having a garage sale.
Some sharp operators do the next best thing.
They rent miniature blimps, send them up above the housetops, and tether them there on their sale days. Of course, this giant balloon or miniature blimp has some sort of sign on the side of it, inviting people to your garage sale. This is one of the strongest available advertising ideas for pulling traffic to a sale of any kind. You have to give your sale some flair. Put some posts up across the front of your property and run some twisted crepe paper between them - or better than crepe paper, run brightly colored ribbons.