vehicle from shifting into drive while the wheelchair lift is in operation. Ramps In 2002, innovations allowed the development of wheelchair lifts that assist people in entering truck cabs, so that they may drive or operate heavy equipment. Wheelchair lifts can also be used to move an unoccupied scooter into a vehicle. Low-floor transit vehicles (buses, streetcars, light rail cars) – fitted with ramps or bridge plates rather than lifts – later began to become more common than lifts for heavy-duty transit vehicles, while lifts continue to be used in paratransit vehicles. While some wheelchair-accessible vans use a powered lift to assist the occupant in boarding, a wheelchair ramp is usually less expensive for this purpose and is often installed on minivans. Full-size vans require the use of a platform lift. There are two types of platform lifts installed on wheelchair-accessible vans: single-arm and dual-arm. Single-arm wheelchair lifts are only used in side-entry applications. They take up less interior space and leave the passenger entry open; however, they have less lifting capacity than dual-arm lifts. Most dual-arm wheelchair lifts have a lift capacity up to 800 pounds. These lifts consume more interior space and block the side entry and, for these reasons, are often mounted in the back of the vehicle for rear-entry applications. Residential and commercial lifts A residential wheelchair lift is typically installed inside or outside of an individual's home to provide wheelchair access. Most often the wheelchair lift is installed against a deck, porch, or raised entryway door. The lift can take the place of a set of stairs in some situations. Additionally, a set of stairs and a landing can be custom built to provide access via the lift or stairs. Commercial wheelchair lifts are often installed to meet ADA requirements, when an elevator is cost prohibitive or will be used only occasionally. These lifts are typically planned for during the construction or renovation of a commercial/business space. Commercial wheelchair lifts can be found in restaurants, bars, churches, community centers, and many other places of business. Indoor vs. outdoor vertical lifts An indoor vertical platform lift operates much like an elevator which is installed within a hoist-way or shaft-way. Although the installation of a vertical platform lift is similar to that of an elevator, it's much less expensive. Some models offer options to finish a vertical platform lift to make it operate more like a home