The answer is closed operating space.
To be a safe driver, you must know how to manage the road space around your vehicle. Drivers need to identify the types of spatial conditions that exist while driving. One of these conditions is closed conditions. A closed zone or a closed condition is a space condition in which the level of risk is increasing. It is not available to your vehicle’s path of travel and that there is a restriction to the drivers space or that view is not available in a certain zone.