What speed restriction applies below 10,000 feet but above Class B airspace corridors?

The speed restriction that applies below 10,000 feet, but above Class B airspace corridors, is 250 knots. This rule is in place to ensure safe operation of aircraft in congested airspace where there may be a higher density of traffic and potential conflicts with slower-moving aircraft.

The Federal Aviation Administration (FAA) sets this restriction as part of its regulations to manage air traffic effectively. While operating below 10,000 feet, pilots are expected to adhere to these limitations to maintain safety and order in the skies.

While other options reflect different speed limits, they do not apply in this specific altitude range and scenario. For example, 200 knots is a speed limit that applies at certain points within Class B airspace; 300 knots is not a standardized limit for general operations; and the phrase "no restrictions" suggests total freedom to fly at any speed, which would be unsafe in heavily trafficked areas. Therefore, pilots operating below 10,000 feet must comply with the 250 knots restriction to ensure safe navigation and reduce the risk of collisions.