Which ATC service helps to prevent collisions on taxiways?

The service that helps to prevent collisions on taxiways is Ground Control. This ATC service is responsible for managing all aircraft and vehicle movements on the ground, excluding active runways. Ground Control plays a critical role in ensuring that all aircraft are safely guided to and from taxiways, and it instructs vehicles operating on the airfield. By providing clearances, directions, and maintaining continuous communication with pilots and vehicle operators, Ground Control minimizes the risk of collisions and enhances overall safety on the airport's taxiways. The effectiveness of this service is vital in busy environments, where multiple aircraft and vehicles may be simultaneously navigating the ground.

The other services mentioned serve different functions. Approach Control manages aircraft as they arrive at the airport, ensuring safe distances as they descend and prepare for landing. Departure Control handles aircraft that are taking off or climbing out, while Tower Control has authority over both the runway operations and the immediate airspace around the airport. Each of these services plays a unique role but does not directly manage ground movements like Ground Control does.