There are still people who walk to shop at garage sales, especially when they live right nearby, but most these days drive their cars -- to have a way to transport what they buy, to stay out of the heat of the garage saling summer, and to avoid having to strain themselves too much. Unfortunately, the sudden glut of cars means you'll have to find parking spots for all of these newcomers to the block. Designating parking spots for customers keeps things a little less hectic, though there's a bit of extra work involved.
Ask your neighbors if you can utilize their extra spots. Neighbors who particularly dislike the crowded atmosphere of a garage sale may clear out while you're hosting, leaving their driveway open. If you know any of your neighbors are leaving -- or if they will be gone on vacation or for work -- ask them if they would mind letting customers temporarily park at the end of their driveway. Assure them that if cars do any damage, you will pay for it.
Post up signs on sticks embedded in the grass (or borrow sandwich boards, for those without grass) to indicate where customers can park. Depending on the size of your garage sale, you can even put time limits on the spaces closer to the sale, so that shoppers who will be taking a long time will park further away from the action. Even if you don't want to deal with time limits, post up signs that point out where it's good for shoppers to park.
Block off a section of a dead end road and guide customers there. In some neighborhoods, there are lots of tiny dead end residential streets. Though these are difficult to navigate, you can guide your customers there to park if they are planning on staying a while (thus making the difficult parking job worth it) -- be sure, though, that you speak with the residents of the street ahead of time to see if it's okay with them.
Put up signs for where customers can't park, too! If there are spots in your neighborhood, particular right up near your garage sale, where you would prefer shoppers not to put their cars, then you can make signs to designate no-parking spots as well. Don't be deceptive with your text -- make it very clear that it says no parking, and not something along the lines of "park here." Big red text is pretty helpful in that regard!
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