Chicago is the latest city to roll out so-called airport cell phone lots. These parking facilities allow you to park for *free* while waiting to pick someone up, as long as you stay in the car and leave within an hour. They’re “cell phone lots” because the traveler is presumably calling the driver to let them know they’ve arrived.

Houston, Seattle, Charlotte, Philadelphia, and San Diego are other U.S. cities with similar features at their airports. The lots are designed to reduce traffic and emissions from circling cars. Most also require you to turn off the car while in the lot. (Houston, which allows idling, is a notable exception on that count…)