Gupakira Igitekerezo Mw'isi ya none, abantu bahora bahura ningaruka ziterwa ningaruka mbi zituruka hanze. Ibidukikije bibi, injyana ihuze yubuzima muri megalopolises cyangwa guhangayika biganisha ku mizigo yiyongera kumubiri. Kugirango usanzwe kandi utezimbere imikorere yumubiri, inyongera zikoreshwa. Ikigereranyo nyamukuru cyuyu mushinga cyahindutse igishushanyo cyo kuzamura imibereho myiza yumuntu ukoresheje inyongera. Na none, ibice nyamukuru bishushanyo bisubiramo imiterere yinyuguti F - inyuguti yambere mwizina ryikirango.

