# The Motor Vehicles (Driving Licences) Regulations 1999, Paragraph 2


Trainees' eyesight must be tested. Trainees must be able to read, in good daylight (with the aid of corrective lenses if worn) either—
a vehicle registration mark containing letters and figures 79 millimetres high and 57 millimetres wide at a distance of 20.5 metres, or
a vehicle registration mark containing letters and figures 79 millimetres high and 50 millimetres wide at a distance of 20 metres.

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Source: https://www.legislation.gov.uk/uksi/1999/2864/schedule/12/paragraph/2n1 (the official version)
Page: https://openlegislation.uk/motor-vehicles-driving-licences-regulations-1999/schedule-12/paragraph-2n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.