Amazon will start delivering packages to parked cars starting Tuesday, according to The New York Times. The rollout of the new delivery method, available in 37 U.S. cities for those who have the proper technology in their vehicles, allows a courier to pop the trunk or open the back door with a “few taps on a smartphone screen.” A package would then be dropped off in the trunk or left on the back seat. The delivery method is only available for customers with 2015 or later models of Chevrolet, Buick, GMC, Cadillac or Volvo cars equipped with roadside-assistance technology, the Times reported. Amazon intends to expand the service to other car makers over time, and will only allow couriers to unlock the vehicle once during delivery. This comes as the company recently rolled out Amazon Key, which allows a package to be dropped off directly inside a home to avoid thieves.