What is a common feature of taxiway markings?

Taxiway markings are essential for guiding pilots and ground vehicle operators around the airport. A common feature of these markings is that they use letters to designate specific taxiways. Each taxiway is assigned a unique letter or combination of letters, which helps in identifying them clearly on airport diagrams and during communication between pilots and air traffic control. This system of identification is crucial for ensuring safety and efficiency in airport operations, as it allows for precise navigation and reduces the risk of confusion or accidents on the airfield.

The choice regarding green dashed lines is not correct since such markings are associated with specific areas rather than taxiways. Flashing lights are typically used for specific warning signs or to direct traffic but are not the standard for taxiway designation itself. Similarly, solid white lines are used for taxiway edge markings but do not provide specific identification of the taxiway. Thus, the use of letters as identifiers is the defining characteristic of taxiway markings in the context of aviation operations.