All-terrain power wheelchairs, with their extra large, wide-tread tires, are designed primarily for driving over rough, outdoor surfaces. 

Some are equipped with crawler tracks to handle conditions which would be extremely difficult, and potentially hazardous, for a medical power wheelchair. These include:

• mud, sand and overgrown grass
• rocky roads and paths covered in snow, slush, sleet or ice
• steep hills, steep inclines and steep slopes

This may, in part, help to explain why extreme outdoor power chairs appeal to the young and adventurous.