Self-propelled scissor lifts, the most common type of Mobile Elevating Work Platforms (MEWPs) move vertically through folding supports in a ‘X’ pattern, known as scissor mechanism. They are classified in 2 main categories based on how these are powered and where they are used. Battery powered (or electric) scissor lifts are used mainly indoors on slab surfaces, while the engine powered ones are used outdoors where the surfaces are frequently uneven (for this reason they are commonly referred to be for ‘rough terrain’). Regardless of how they are powered, they have many sensors and controls to manage movement, safety, and mainly stability (operators on the platform are subject to fall hazards, therefore safety is a priority)
