Walk-behind saws are often used for trenching, repair, and other concrete and asphalt applications. If safety precautions are not taken seriously, walk-behind saws can be dangerous. Anyone operating a walk-behind saw must be trained and authorized before use. This safety topic provides important reminders about hazards associated with operating a walk-behind saw, guidance for transport, and the safety precautions required to prevent the dangers of carbon monoxide and respirable silica dust.