The term 'obstructions to passage' can refer to any physical or mental barrier that prevents someone from moving forward. Barricades, which is a 10-letter solution to the crossword, are one example of an obstruction to passage. Barricades are typically constructed from materials such as wood, metal, or concrete and are used to block off roads, entrances, or other areas. They are often used to control crowds or to prevent access to certain areas.