Vehicles older than 15 years old, are classified as salvaged or rebuilt or have aftermarket seating modifications (e.g., installed seats and seatbelts) are not allowed in Uber. Requirements can also expand or shrink depending on the Uber program. For example, a vehicle with four doors is mostly required but 2-door vehicles are allowed when driving for Uber Eats, a food delivery service. Vehicles cannot be older than 15 years but the requirement tightens to no older than six years when driving for Uber Black, a luxurious rideshare service for passengers.