Characteristics of Emerging Road and Trail Users and Their Safety

Power Wheelchairs

(Photo by Peter Axelson.)
Figure 9. Power wheelchair.

Power wheelchairs utilize battery power to move the wheelchair (figure 9). Power wheelchairs are expensive relative to manual wheelchairs and typically weigh up to 115 kilograms (kg) (250 pounds). They often cannot be folded or disassembled for transport, so a ramp or lift-equipped van is required. The weight and bulk of a power wheelchair severely limits the size of obstacles-usually less than 50 mm (2 inches) in height-that can be negotiated without a ramp or bevel. Braking is usually passive; it occurs with deceleration when the power is turned off. Power wheelchairs are available in many different shapes and sizes. Many different wheel sizes are available as well.

Individuals who use power wheelchairs typically have conditions that significantly limit their upper and lower body movement, strength, coordination, or endurance. Various control units are available that enable individuals to control the movement of their power wheelchair with very limited independent movements (e.g., a puff of breath).