A radial tire is a type of tire construction where the internal layers of fabric, known as plies, are arranged at a 90-degree angle to the direction of travel. This design allows for better flexibility and improved contact with the road, enhancing traction and stability. Radial tires are commonly used in vehicles like cars and trucks due to their durability and performance. The radial tire was first introduced in the 1940s and has since become the standard for most modern vehicles. Compared to bias-ply tires, radial tires typically offer lower rolling resistance, which can lead to better fuel efficiency. They are also known for providing a smoother ride and longer tread life.