How to replace turn signal bulb for Audi A3 (8P)

Vehicle turn signals or directional indicators are blinking lamps, located at the front and rear corners of the body. It's a responsibility of each driver to use these lamps properly and let others know, that the car is about to stop/start moving or change movement direction. It's critical to exploit turn signals opportunely, thus giving other drivers a notice about vehicle position changes. Therefore, all directional signals should be operating without problems. Usually, the source of a faulty turn indicator is an obsolete bulb, that the driver is able to notice straight off: when driver engages turn signal, flickering of respective dashboard indicator will be faster than usual, although sole bulb has failed.