Introduction to the course. Working environment. Civil engineering machines and the operator as a source of risks at work. Risks caused by the working environment (safety of construction site and workplace, landslides, soil degradation, presence of pipelines and electricity lines, collision with other mobile machines). Risks caused by the machine (improper use, technical malfunction, instability of the machine, warning signs on the machine, operator`s workplace, visibility from the operator`s booth, quality of commands and signalization of working regimes and machine conditions, signalization of overload, automatic control of operations and working processes. Instructions for operation and maintenance. Ensuring the proper operation of the machine (instructions for maintenance and repair of the machine, making a record of carried out operations of maintenance and repairs, periodical check-ups of the machine). Risks caused by the operator (disrespecting instruction manual, insufficient training of the operator, avoiding of the use of the protection equipment, work under the influence of alcohol, drugs, fatigue of the operator). Measures for increasing safety in working with civil engineering mechanization.