51.26. Are drivers of trucks with a maximum permitted mass exceeding 3.5 t, tractors, and buses required to use special mountain brakes installed by the manufacturer when driving on mountain roads and steep descents?
UAЧи повинні водії вантажних автомобілів, максимальна дозволена маса яких перевищує 3,5 т, тракторів і автобусів під час руху по гірських дорогах і крутих спусках користуватися спеціальними гірськими гальмами, встановленими заводом-виробником?
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This is an exam question from the Traffic Rules of Ukraine concerning road safety on mountain roads and steep descents, where the risk of overheating the service brakes and losing control increases for heavy vehicles. Such conditions require special driver discipline, as prolonged braking with the "pedal" on a descent can lead to a sharp drop in braking system efficiency and emergency situations.
The question tests knowledge of the section of the traffic rules regulating movement on mountain roads (paragraph 28.2 of the Traffic Rules). The regulation directly obliges drivers of trucks with a maximum permitted mass over 3.5 t, as well as tractors and buses, to use special mountain brakes if they are provided by the design and installed by the manufacturer. This obligation is key to choosing the correct answer on the theoretical exam.
An option that denies the necessity of using mountain brakes contradicts the requirements of paragraph 28.2, as it ignores the mandatory use established by the Rules when a standard system (such as a retarder or engine brake) is present. In practice, knowledge of this regulation helps to safely maintain speed on descents, reduce the load on the service brakes, and better control the vehicle in difficult road conditions.
Clause 28.2
On mountain roads and steep descents, the driver of a truck with a maximum permitted mass exceeding 3.5 t, a tractor, or a bus must: a) use special mountain brakes if they are installed on the vehicle by the manufacturer; b) when stopping or parking on ascents and descents, use wheel chocks.
Application: the rule directly establishes the obligation for drivers of the specified vehicles to use special mountain brakes while driving on mountain roads and steep descents (if such brakes are present in the design and installed by the manufacturer).
That is, the correct answer is "Must.", given that according to the definition in Traffic Rules clause 28.2 (subclause "a"), the driver is directly required to use special mountain brakes on mountain roads and steep descents if they are installed by the manufacturer.
When driving in the mountains, the main danger for heavy vehicles and buses is that on long descents, the service brakes can quickly overheat and lose effectiveness. Therefore, the Rules provide additional requirements specifically for trucks with a maximum permitted mass of over 3.5 tons, tractors, and buses.
Clause 28.2 of the Traffic Rules of Ukraine directly establishes the obligation for drivers of such vehicles on mountain roads and steep descents to use special mountain brakes, if they are provided by the design and installed by the manufacturer. That is, if your bus or truck has a retarder, engine brake, or another standard mountain braking system, it must be activated when driving in such conditions.
The logic of this rule is simple: the mountain brake helps maintain speed on the descent without constantly pressing the brake pedal, reduces the load on the service braking system, and increases safety. For example, on a long steep descent, the driver of a truck weighing more than 3.5 tons must use the mountain brake, and not "hold" the vehicle with only the service brakes.
Therefore, the correct answer is "Must.", since clause 28.2 of the Traffic Rules obliges drivers of trucks over 3.5 tons, tractors, and buses on mountain roads and steep descents to use special mountain brakes, if they are installed by the manufacturer.