rw
Mubice byubuhinzi bugezweho, ibikorwa byo kuhira neza ni ngombwa mugutezimbere umusaruro wibihingwa no kubungabunga umutungo wamazi. Muri sisitemu zitandukanye zo kuhira, sisitemu yo kuhira muburyo bwa truss yagaragaye nkigihitamo kizwi cyane kubahinzi benshi. Sisitemu itanga ibyiza byinshi bishobora kuzamura cyane ibikorwa byubuhinzi, cyane cyane mubikoresho byubuhinzi.