A tridem axle is a type of axle configuration commonly used in heavy vehicles, such as trucks and trailers. It consists of three axles grouped closely together, which helps distribute the vehicle's weight more evenly across the road. This design improves stability and reduces the risk of damage to road surfaces. Tridem axles are often found in vehicles designed for transporting heavy loads, such as construction equipment or bulk materials. By spreading the weight over three axles, these vehicles can carry larger loads while complying with weight regulations, making them efficient for commercial transportation.