First 15 minutes of free parking if using parking clock (parking starting time).
Parking clock or written notice with parking starting time has to be under vehicle windscreen visible.
15 minutes of free parking is valid only in city paid parking zone (NB! Not valid in private parkings). Free parking in private parkings is valid where it is separately stated in parking circumstances.
More information about the parking places: http://www.parkimine.ee/en/parking/tallinn