The horizontal printing density, the typeface, the type size, the font and the vertical line spacing in the VIZ are at the
discretion of the issuing State or organization. For good legibility a type size with 10 characters per 25.4 mm (1.0 in) is
recommended. A maximum of 15 characters per 25.4 mm (1.0 in) should not be exceeded. This type size has been
chosen as the smallest in which information is clear and legible to a person with normal eyesight.
Use of upper-case characters is recommended. However, where a name includes a prefix, an appropriate mixture of
upper and lower case characters may be used in the prefix (see 3.4 in this section).
Diacritical marks (accents) may be used with either lower- or upper-case characters at the option of the issuing State or
organization.