Until June 2013 the use of an oldtimer with O-license plate was required, confined to test drive within a radius of 25 kilometers, between sunrise and sunset, in the context of a properly authorized manifestation or to travel toward the duly authorized manifestation. Since July 2013 oldtimers are allowed to drive day and night.
This needs no longer to be, within the context of a proper authorized manifestation. Oldtimers are vehicles that have been in use for more than 25 years and who are registered with a license plate whose group starts with a letter "O".