Which statement is true regarding departure procedures?

The statement indicating that obstacle departure procedures (ODPs) are primarily designed for obstacle clearance, while standard instrument departures (SIDs) reduce ATC workload, accurately captures the distinct purposes of these procedures. ODPs are specifically created to ensure that aircraft can safely navigate away from an airport while avoiding obstacles in the surrounding airspace. They provide necessary guidance to pilots for safe departure routes when air traffic control services are not provided.

On the other hand, SIDs facilitate the flow of air traffic by offering predefined routes and altitudes for departing aircraft, thus streamlining communications and reducing the workload on air traffic controllers. This allows for efficient management of air traffic, especially at busy airports.

The other options do not align with standard definitions or regulations regarding departure procedures. For instance, visual references are not a requirement for all departures, as both ODPs and SIDs often involve instrument flight rules (IFR) where visual cues may not be available. Additionally, SIDs are not exclusively for turbojet aircraft; they can be used by any type of aircraft that meets the specific performance requirements. Finally, ODPs do not necessarily have to be filed with air traffic control—they may be flown without clearance, particularly in situations where a pilot is capable of ensuring