J. Lehaitre's Tractor-Cycle, developed in 1938, was an unusual all-terrain vehicle that combined features of a motorcycle and a tracked tractor. Instead of relying on conventional wheels alone, it used a tracked rear section that provided excellent traction across mud, sand, snow, and rough ground. Although its top speed was only about 25 mph (40 km/h), the design prioritized mobility over speed, allowing it to traverse terrain that would stop most vehicles of its era. Lehaitre later experimented with military variants, including a version equipped with a machine gun, reflecting the growing interest in versatile off-road vehicles during the years leading up to World War II.