This document discusses various types of machinery used in highway construction. It describes road rollers, which are used to compact soil and come in several types including smooth wheeled, sheep foot, pneumatic tyred, and vibratory. Dozers are used for tasks like cutting, pushing, and spreading material and also come in types like bull, angle, and tree dozers. Other machinery discussed include graders, trenchers, scrapers, rippers, scarifiers, tractors, concrete mixers, tip wagons, and draglines. Concrete mixers are described in more detail, outlining portable and batch plant types as well as tilting and non-tilting models.