Isu tiri veChina vakakura nyanzvi kugadzira uye fekitori ye-self-propelled convex mutsara wemugwagwa wekumaka michina.Zvinoenderana nenhau dzepasirese nyaya dzehuwandu, tsaona dzemumigwagwa dzichaderedzwa neinopfuura 30% mushure mekunge mitsetse yeconvex mark yagamuchirwa, vanokuvara uye kurasikirwa kwehupfumi kwakadzikira zvakanyanya.Nekuda kweizvozvo nyanzvi dzinokurudzira kushandiswa kwerudzi urwu rwemaki mutsara semutsetse wakajairika wekuchengetedza traffic.