What is the purpose of a white box preceding a runway?

A blast pad serves a critical purpose in aviation by providing an area before the runway where aircraft can safely land or take off in the event of an overrun or aborted takeoff. It helps to prevent damage to aircraft and increases safety for both the aircraft and people on the ground. The design and use of blast pads are crucial in ensuring that aircraft have an optimal surface to use in scenarios where they might need extra space, particularly during takeoff or landing phases when aircraft operate at lower altitudes and speeds.

The blast pad often has specific markings, which may include a white box, indicating its purpose clearly to pilots and ground personnel. This distinct marking helps in visual identification, especially under various weather conditions.