Abstract: A parking indicator can be adjusted to assume at least an inoperative position or condition, the presence of which indicates lack of parking permission. Change-over from a condition which does not indicate parking permission, i.e. an operative condition or position, into the inoperative condition and back again, results in the destruction or loss of at least one value symbol. A time indicator is provided in order to indicate the time when parking commences. The time indicator is adjustable only when the parking indicator is in an inoperative condition or while it is being brought into this condition.