The word 路障 is formed by combining two characters: 路, meaning "road" or "path", and 障, meaning "to block" or "obstruction". It is a direct and logical compound where the first character specifies the location and the second character defines the function or object. Together, they create a new, unified concept meaning "roadblock", an obstruction specifically placed on a road. This formation visually and conceptually describes the object's purpose right within the structure of the word itself.