Tread width refers to the distance between the outer edges of a vehicle's tires, specifically the part that makes contact with the road. This measurement is crucial for vehicle stability, handling, and traction. A wider tread can improve grip and cornering performance, while a narrower tread may enhance fuel efficiency. In the context of automobiles, tread width can also affect the overall appearance of the vehicle. Different types of tires, such as performance tires or off-road tires, may have varying tread widths to suit specific driving conditions and preferences. Proper tread width selection is essential for optimal vehicle performance.