What is the standard altitude restriction for IFR flight?

Maintaining assigned altitudes to ensure safety is central to IFR (Instrument Flight Rules) operations. Under IFR, pilots must adhere to specific altitudes assigned by air traffic control (ATC) to ensure separation from other aircraft, terrain, and obstructions. This helps to maintain safety and order in the congested airspace system.

The prescribed altitudes can vary depending on the flight path, airspace class, and other operational considerations. Compliance with assigned altitudes is crucial not only for the safety of the flight but also for the smooth operation of air traffic as a whole.

While other options may touch upon altitude considerations relevant to IFR, the fundamental principle of always maintaining the assigned altitude as directed by ATC underscores the significance of this aspect in IFR flying.