1. VNA (inzira ifunganye cyane) ni igishushanyo cyubwenge bwo gukoresha ububiko bunini bihagije.Irashobora gushushanywa kugera kuri 15m z'uburebure, mugihe ubugari bwa aisle ari 1,6m-2m gusa, byongera ubushobozi bwo kubika cyane.
2. VNA irasabwa gushyirwamo gari ya moshi iyobora hasi, kugirango ifashe kugera ku gikamyo kigenda imbere mu kayira neza, hirindwa kwangirika kw’ibisambo.