What feature consists of double doors placed on roadways to prevent short circuiting of ventilation current?

The feature that consists of double doors placed on roadways to prevent the short circuiting of ventilation currents is referred to as an air lock. An air lock is specifically designed to create a controlled environment by ensuring that when one door is closed, the other door remains closed until it is safe to open, thereby minimizing air loss and maintaining effective airflow. This is critical in a mining environment, as it helps to ensure that fresh air is directed through the mine and that potentially hazardous gases or low-oxygen air are contained and controlled.

The use of air locks is a common practice to enhance ventilation efficiency and maintain the safety of miners by preventing cross-contamination of air currents. Consequently, this ensures that the structured airflow necessary for effective mine ventilation is sustained, which is crucial for the well-being of those working underground.