This document is a teacher's guide for a unit in tractor and machinery safety for college freshmen. It is intended to be used for 10 hours of instruction for freshmen who are intending to work on or around machinery. Safety hazards directly and indirectly related to many types of machinery are covered in addition to tractors. The objectives of the unit are to help students to develop an understanding of farm accident prevention and the ability to identify types of tractors and machinery and the use of each, to operate a tractor safely, and to perform basic tractor and truck maintenance. The unit is divided into material for four jobs, as follows: (1) identifying types of tractors and machinery; (2) understanding farm accident prevention; (3) operating a tractor safely; and (4) maintaining tractors and trucks. Each of the jobs includes objectives, guide questions, references, an approach to interest students, key facts about the content of the material, and transparency masters. The material can be used to fulfill student requirements for the Tractor Operator's Training Certificate if certain provisions are met. (A student manual coordinated to the unit is available.) (KC)