47.3. What must be done before opening the bonnet if smoke is coming from under it?
UAЩо необхідно зробити перед відкриттям капота, якщо з-під нього йде дим?
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This exam question from the Traffic Rules of Ukraine concerns road safety in emergency situations when smoke is coming from the engine compartment. Such signs often indicate overheating or a possible fire due to faults in the wiring or fuel system, so the driver's actions must be quick, consistent, and safe. The theoretical exam covers precisely those algorithms that reduce the risk of fire, burns, and rapid flame development.
According to the content, the traffic rules test knowledge of sections about the driver's duties and response to danger (in particular, the requirements to stop immediately and take action), as well as the mandatory equipment of the vehicle (the presence of a working fire extinguisher). The logic of the options is as follows: turning off the engine and, if available, using the remote battery disconnect switch reduces the risk of short circuits and cuts off power; preparing the fire extinguisher is important because when the hood is opened, smoldering can instantly turn into open flames; protecting hands with gloves or cloth is necessary due to the high temperature of the hood and parts underneath, to avoid burns. Each action is useful on its own, but the correct approach in the traffic rules is to perform the entire set, because skipping any step leaves a critical risk (power supply, lack of a ready means of extinguishing, or injury to the driver).
The practical significance of this rule is that smoke under the hood requires not panic, but proper preparation before opening: first, de-energize and stop processes that may support ignition, then ensure readiness to extinguish, and only then carefully open the hood, avoiding a sudden influx of oxygen. This wording helps students better remember the sequence of actions and answer exam questions correctly during the theoretical test on the Traffic Rules of Ukraine.
Clause 12.3
In case of a danger to traffic or an obstacle that the driver can objectively detect, he must immediately take measures to reduce speed up to stopping the vehicle or safely bypassing the obstacle for other road users.
Brief application: smoke from under the hood is an obvious danger, so the driver must immediately stop and act to minimize risks (in particular, turn off the engine/power and prepare for a possible fire).
Clause 2.3 (subclause "a")
To ensure road safety, the driver is obliged: before driving, to check and ensure the technical serviceability and completeness of the vehicle, as well as the correct placement and securing of cargo.
Brief application: "completeness" covers the presence of mandatory equipment needed to respond to dangerous situations (in particular, a fire extinguisher), and the driver's readiness to use it in case of smoke/fire.
Clause 31.4.7
It is prohibited to operate vehicles according to the law in the absence of a first aid kit, an emergency stop sign (flashing red lamp), and a fire extinguisher (for vehicles that are required to be so equipped).
Brief application: the requirement to have a working fire extinguisher is directly related to actions in case of smoke from under the hood — before opening the hood, it must be taken out and prepared for use.
That is, the correct answer is "All of the above.", given that according to the Traffic Rules, in case of danger the driver is obliged to immediately take measures up to stopping, as well as ensure the completeness of the vehicle (including the presence of a fire extinguisher), so before opening the hood in case of smoke, it is necessary to simultaneously minimize the risk of ignition (turn off the engine/power), prepare the fire extinguisher, and open the hood carefully.
When a driver notices smoke coming from under the hood, this indicates a potential fire hazard or overheating, and it is necessary to act in a way that both reduces the risk of ignition and prepares for quick extinguishing. That is why several mandatory steps must be taken before opening the hood, not just one.
First of all, the engine must be turned off. While the engine is running, there are sources of heat and possible fuel or oil leaks under the hood, as well as the continued operation of electrical systems. If the vehicle has a remote battery disconnect switch, it should also be turned off to disconnect the battery from the electrical system. This is important because smoke is often caused by a short circuit, and breaking the electrical circuit can stop the wiring from heating up and reduce the development of a fire.
Next, you need to take out the fire extinguisher and prepare it for use. The Traffic Rules require that a functional fire extinguisher be present in the car, and in a situation with smoke, you cannot delay: if smoldering suddenly turns into open flames when the hood is opened, there will be no time left to prepare. Therefore, the fire extinguisher should be taken out immediately and prepared for use in advance.
Only after this can you proceed to open the hood, but this should be done carefully. If you open the hood abruptly, more oxygen will enter the engine compartment, and what was only smoldering may quickly ignite. In addition, the hood itself and the parts underneath may be very hot, so your hands should be protected with improvised means to avoid burns, and the hood should be opened slowly, keeping the situation under control.
Therefore, the correct answer is "All of the above," because before opening the hood in case of smoke, you must simultaneously stop the engine and, if possible, disconnect the power supply, prepare the fire extinguisher, and open the hood carefully and with hand protection, so as not to intensify the fire or get injured.