How can a pilot determine how much runway is left during a landing roll out?

The ability of a pilot to determine how much runway is left during a landing rollout is primarily facilitated by runway remaining black signs with white numbers. These signs are strategically placed along the runway and provide clear and immediate information about the distance remaining to the end of the runway, which is particularly crucial in landing scenarios. Pilots rely on these visual indicators to make informed decisions regarding braking, rolling out, and ensuring a safe stop before the runway ends.

While runway markings in the center, a visual inspection of the runway, and electronic flight display readings can provide some level of information, they do not deliver the specific distance remaining as directly and clearly as the runway remaining signs do. Runway markings in the center are more focused on guiding the aircraft during taxi and takeoff rather than providing an exact distance measurement. Visual inspection can vary based on the pilot's position and may not give an accurate assessment of remaining runway. Electronic flight displays can present a multitude of information, but they often do not specifically indicate the exact distance left unless explicitly programmed or connected to the runway's distance data.

Thus, runway remaining black signs with white numbers are the most reliable and effective means for pilots to assess the remaining runway distance during landing.