Back at PR/PR Blog HQ after a long weekend in Chicago—what a great city! I attended a close friend’s wedding, so while not enjoying the event’s menu I essentially subsisted on Italian beef sandwiches. I think I ate 5 of them over the course of the weekend.

I returned last night, but I may have come back a bit too early. No, not because I need another beef sandwich; but because The Windy City is one of the pilot markets for Amazon’s new “trunk delivery” system.

What is trunk delivery? Glad you asked.

Not content to rest on his laurels—especially after last week’s announcement that Amazon would be scrapping its plan to dive into the pharmaceutical industry—Jeff Bezos has unveiled a new system where the company can deliver packages directly to the trunks of Prime members’ cars. The company famously introduced a program where it will drop off your orders inside homes, but now that logic applies to vehicles as well.

Certain cars (with OnStar) allow for keyless, remote entry. Amazon has adjusted its Amazon Key app to be compatible with OnStar and permit entry for couriers to place packages in the trunks of vehicles. It’s a fantastic option for people living in dense urban areas—who also happen to be enticing targets for package thieves.

Users are provided a time window for when their package will arrive to their trunk, and instructed to have their car parked in an accessible area near their home address. Once their orders have been dropped off, they receive a notification that the delivery is complete.

This would have been an interesting tech experiment whilst in Chicago. If the new program is successful, it will be unveiled throughout the country.

Amazon is constantly finding new ways to streamline the online delivery market, and with trunk delivery they’re checking off yet another box that has made them one of the world’s dominant companies.