Peapod, an online grocery and delivery service affiliated with supermarket chains throughout the U.S., has introduced a service in the Philadelphia area that uses scannable QR codes on advertising boards in Southeastern Pennsylvania Transportation Authority rail stations.

To access the service, a person first uses his or her smartphone to scan the QR code listed in the ad to load the Peapod app. The next step is to use the barcode icon to begin scanning the items on the ads and, once in the app, browse as if examining shelves in a store. Peapod then delivers the groceries to the shopper’s address.

The philosophy behind this effort is simple: when people have idle time on their hands—and a smartphone!—why not have them shop on a platform rather than go to the store? Further, they can order their products on their way in to work, and if they like, rather than have them delivered, stop by to pick them up on the way home. Further, this service might be particularly appealing to consumers when their time is a scarce commodity.