A clearway can be crucial for increasing which of the following metrics in a take-off?

A clearway is an area beyond the runway at the end of the take-off distance that is free of obstacles and can be used to increase the available distance for an aircraft to take off. By providing additional space for the aircraft to gain altitude before encountering any obstacles, a clearway effectively increases the take-off distance available. This is particularly important for aircraft that require more distance due to weight, environmental conditions, or performance limitations.

The take-off distance available is critical for ensuring that an aircraft can safely clear any obstacles in its flight path during take-off. With the addition of a clearway, the pilot can be assured of having more room to achieve the necessary speed for lift-off, particularly important in situations where runway length might be limited or when operating at airports with restrictions.

In contrast, the other options do not directly correlate with the function of a clearway. Landing distance is influenced by different factors, including runway length and aircraft configuration, rather than being affected by a clearway. Runway clearances refer to the distances that must be maintained from obstacles during operations and do not increase due to the presence of a clearway. Take-off roll pertains to the distance the aircraft travels down the runway before take-off, which can be influenced by various factors but