According to the Law of the Republic of Armenia "On Ensuring Road Traffic Safety", a certificate of the right to drive "D" category and "D1" sub-category vehicles can be issued:

Explanation

Persons aged 21 and over.

The rule: a licence for category "D" and sub-category "D1" is issued only to persons of twenty-one and over. These two categories mean carrying passengers by bus and minibus; the driver is simultaneously responsible for the lives of several dozen people who have no control over the driving and cannot even see the state of the road. The three-year gap from eighteen is no accident: in practice it guarantees that the applicant has already obtained a light-vehicle licence and has several years of real driving in urban and intercity traffic.

There is a technical reason alongside it: a bus has a high centre of gravity, large blind spots at the side and rear, a wide turning radius and a long braking distance, and its behaviour changes as passenger weight shifts in bends. Memorise the number 21. The other three options are exactly the rungs of the age ladder for lighter categories, which is precisely why they appear in the question.

• 18 is the age for the base categories "A" and "B"; it is not enough for carrying passengers by bus. • 19 is the age for category "BE", that is driving with a heavy trailer, not carrying passengers. • 20 is not the threshold for any category and appears only to fill the gap between 19 and 21 among the options.

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