Bulletin #2323, Maine Farm Safety Program: Big Tractor Safety (PDF) By Dawna L. Cyr, Farm Safety Project Assistant, and Steven B. Johnson, Ph.D., Extension Crops Specialist For information about UMaine Extension programs and resources, visit extension.umaine.edu. Find more of our publications and books at extension.umaine.edu/publications/. Giant four-wheel-drive tractors are now used on many farms. Though