108 | / In order to safely conduct nal approach, landing, taxiing and takeo operations around the clock at Belgrade Nikola Tesla Airport, it is essential that pilots have the best possible visual contact with the airport runway in order to carry out all ground and air operations. Formost of us, lookingout thewindow of a plane at the variety of white, red, green, yellow, blue lights, yellow and white lines on the runway is a sign that we are just about to land and that after landing we can turn our mobile phones back on. To pilots, the lights and markings on the runway are more like a secret language - a language vital to safety when the plane is still in the air and after it lands. That’s because these visual aidsmust be clear to pilots fromall over the world, standardising their position and light characteristics is very important. All parts of themaneouvering surfaces - taxiways or aprons - have their alphanumeric features, which are contained in the airport maps and whose illuminatedmarkings are placed at prescribed locations. The letters and numbers marked with taxiways, aprons or positions are pronounced in an identical manner according to the “Radiotelephony Spelling Alphabet” table, knowledge of which is obligatory for all active participants in air tra c (pilots, air tra c control, airport services etc.). Modern lighting systems such as those at Belgrade Nikola Tesla Airport are very complex in their design and signi cantly increase the safety of air tra c, especially in conditions of reduced visibility. After leaving the parking position, the rst challenge for the pilot is to bring the plane to the runway. Whether day or night, the variety of di erent light signals make it easy to maneouver through the maze of taxiways. The lights on the edges of taxiways to the runway are always blue. The blue lights are easy to spot when you look at the runway from the airport building, but often these are the rst lights at the airport that passengers see on landing. The blue lights on the taxi-