30.12. On which vehicles is this identification sign installed?
UAНа яких транспортних засобах встановлюється цей розпізнавальний знак?
This is an exam question from the Traffic Rules of Ukraine (PDR) concerning road safety and proper interaction between drivers through identification signs on vehicles. Such markings are necessary so that other road users can quickly assess the driver's characteristics and choose the correct way to warn about danger, especially in situations where a sound signal is usually used.
The question tests knowledge of the section of the Traffic Rules regarding identification signs (paragraph 30.3 b), which describes the 'Deaf Driver' sign and clearly defines to whom it is intended and where it should be placed (front and rear). In the theoretical exam, it is important not to 'guess' based on logic, but to rely on the wording of the Traffic Rules: this sign is used specifically for vehicles driven by drivers with hearing impairments, including both deaf and deaf-mute individuals.
The analysis of answer options comes down to correctly distinguishing similar categories. The option about drivers with disabilities is incorrect, because a different identification sign is provided for them in the Traffic Rules, and the 'Deaf Driver' sign is not a universal disability marker. The option about only deaf drivers is incomplete, since paragraph 30.3 b) explicitly includes deaf-mute drivers as well; that is why the correct wording includes both categories.
The practical meaning of knowing this topic for traffic rules is simple: upon seeing such a sign, other drivers should understand that a sound signal may not work, so it is more appropriate to use light signals or other safe means of communication to attract attention. This reduces the risk of misunderstandings on the road and increases overall traffic safety.
Clause 30.3 b) (identification mark "Deaf driver")
"The following identification marks are installed on the corresponding vehicles: … b) 'Deaf driver' — a yellow circle with a diameter of 160 mm with three black circles with a diameter of 40 mm inside, arranged at the corners of an imaginary equilateral triangle, the apex of which is directed downward. The mark is placed at the front and rear of vehicles driven by deaf or deaf-mute drivers."
This clause directly specifies on which vehicles the identification mark "Deaf driver" must be installed, and exactly where it is placed (front and rear).
That is, the correct answer is "On vehicles driven by deaf or deaf-mute drivers," given that according to the definition in the Traffic Rules, the "Deaf driver" mark is placed specifically on such vehicles.
In this question, you need to recognize the identification sign "Deaf driver" and recall for which vehicles it is provided by the Rules. This is one of the special signs that are installed so that other road users immediately understand the driver's characteristics and can interact with them appropriately.
Let us refer to clause 30.3 (b) of the Traffic Rules of Ukraine. It clearly states that the "Deaf driver" sign is placed at the front and rear of vehicles driven by drivers with hearing impairments, that is, deaf or deaf-mute drivers. Therefore, there is no need to make assumptions or "pick" similar options here: the rule clearly defines who it is intended for.
The practical meaning of such a marking is simple: it warns other drivers that a sound signal may be ineffective for attracting attention. In a road situation where a sound signal is usually given (for example, to warn of danger), other road users should choose other ways of signaling, in particular, light signals.
Therefore, the correct answer is "On vehicles driven by deaf or deaf-mute drivers," since clause 30.3 (b) of the Traffic Rules directly establishes that the "Deaf driver" identification sign is used specifically for vehicles operated by drivers with hearing impairments.