Clause 12.1

“When choosing a safe driving speed within the established limits, the driver must take into account the road situation, as well as the characteristics of the cargo being transported and the condition of the vehicle, in order to be able to constantly control its movement and drive it safely.”

This clause directly formulates the requirement to choose a safe speed specifically for the purpose of constantly controlling the movement of the vehicle and driving safely.

Clause 13.1

“Depending on the speed of movement, the road situation, the characteristics of the cargo being transported, and the condition of the vehicle, the driver must maintain a safe distance and a safe interval.”

This clause checks the knowledge that for safe driving and the ability to react in time, the driver must independently choose a safe distance and interval depending on the traffic conditions.

Clause 2.3 (subclause "v")

“To ensure road safety, the driver is obliged to: (c) in vehicles equipped with passive safety devices (headrests, seat belts), use them and not transport passengers who are not wearing seat belts. It is allowed not to fasten the seat belt for the person teaching driving if the student is behind the wheel, and in populated areas, in addition, for drivers and passengers with disabilities whose physiological characteristics prevent the use of seat belts, as well as for drivers and passengers of emergency and special vehicles and taxis (subclause amended 11.07.2018)...”

This subclause checks the driver’s obligation to use seat belts (if available) and to ensure that passengers are also buckled up, as part of safe driving.

Thus, the correct answer is “Answers 1, 2, and 3.”, given that according to the definition of the Traffic Rules, in order to constantly control the movement and drive safely, the driver must choose a safe speed (clause 12.1), maintain a safe distance and interval (clause 13.1), as well as use seat belts and not transport unbelted passengers (clause 2.3(c)).

For a driver to be able to constantly control the movement of the car and drive it safely, the Traffic Rules require not just one separate action, but a combination of conditions that the driver must ensure while driving. That is why, in this question, the correct option is the one that combines several mandatory requirements.

First, the driver must choose a safe speed. According to paragraph 12.1 of the Traffic Rules, the speed should be selected within the permitted limits, but taking into account the actual road conditions, the condition of the car, and the specifics of the cargo. For example, even if the sign allows 50 km/h, during rain, on a slippery surface, or with a heavy load, the safe speed may be lower, because otherwise the driver may not be able to react and stop in time.

Second, to constantly control the situation, the driver must maintain a safe distance and interval. This follows from paragraph 13.1 of the Traffic Rules: the distance depends on the speed and driving conditions and gives time to react if the car in front suddenly brakes; the interval is needed to avoid side contact with vehicles nearby or with road elements. For example, at high speed, a short distance will almost certainly lead to a collision if the car in front brakes suddenly, because the driver behind sees the danger with a delay.

Third, for safe driving, it is important to use passive safety devices. Paragraph 2.3 of the Traffic Rules obliges the driver to use a seat belt (if the car is equipped with one) and not to transport passengers who are not buckled up. This directly affects safe driving: in the event of sudden braking or an accident, the belt keeps the driver in the correct position, which helps not to lose control of the car.

Therefore, the correct answer is "Answers 1, 2, and 3," because to constantly control the vehicle, the driver must simultaneously ensure a safe speed, a safe distance and interval, and also use seat belts and require this from passengers.