Final answer:
A space not open to you because of a blockage to your line of sight or path of travel is called a no-go zone.
Step-by-step explanation:
A space not open to you because of a blockage to your line of sight or path of travel is called a No-go zone. This term is commonly used in the field of urban planning and refers to areas that are restricted or off-limits due to safety concerns or other reasons. Examples of no-go zones can include construction sites, military zones, or areas affected by natural disasters.