Ana amfani da ƙwanan karusar a cikin tsagi, an sanya wuyan murabba'i a cikin tsagi yayin sakawa, wanda zai iya hana ƙwanƙwasa juyawa, kuma ƙwanƙarar motar za ta iya motsawa a layi ɗaya a cikin tsagi. Saboda kan karushin keken yana da zagaye, babu wata tsagi ko tsaka-tsakin kayan aiki da ke akwai don taimakawa hana sata a cikin tsarin haɗin kai na ainihi
