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Clearances (Navigation) (Dcnuc)

Definition
Unobstructed horizontal or vertical spaces. Also, authorization to follow a specified flight outline. Clearances are issued by the control agency appropriate for the controlled area within which the flight will operate and are used to prevent collisions between aircraft. Or, lateral distance from edge of traveled way to a roadside object or feature. (Source: AASHTO Glossary)
Broader Term
Obstructions (Navigation) (Dcnu)