Review of long drive microtunneling technology for use on large scale projects

► Longer drives offer more flexibility in urban, wetlands, and environmental areas. ► Review of state-of-the-art machine technology is provided. ► Drive distance is affected by penetration resistance, pipe characteristics, specialized techniques, and equipment limitations. ► Long drives also increase the applicability of trenchless technology. ► Automated systems based on fuzzy logic improve production and maintain quality.