Umubiri rusange wimodoka ufite inkingi eshatu, inkingi yimbere (Inkingi), inkingi yo hagati (B inkingi), inkingi yinyuma (C inkingi) kuva imbere kugeza inyuma. Ku modoka, usibye gushyigikirwa, inkingi nayo ikina uruhare rwikadiri yumuryango.
Inkingi yimbere ni ibumoso n iburyo imbere ihuza inkingi ihuza igisenge imbere yimbere. Inkingi yimbere iri hagati yicyuma cya moteri na cockpit, hejuru yindorerwamo yibumoso n iburyo, kandi izahagarika igice cyerekezo cyawe, cyane cyane kubumoso, bityo biraganirwaho cyane.
Inguni aho inkingi yimbere ibuza umushoferi kureba nayo igomba kwitabwaho mugihe usuzumye inkingi yimbere geometrie. Mubihe bisanzwe, umurongo wumushoferi ureba unyuze kumurongo wimbere, hejuru ya binocular yuzuye Inguni ya dogere 5-6, uhereye kumyidagaduro yumushoferi, ntoya ya Angle ihuzagurika, nibyiza, ariko ibi birimo gukomera kwinkingi yimbere, ntabwo ari ukugira ubunini bwa geometrike kugirango ugumane ubukana bukabije bwinkingi yimbere, ariko nanone kugabanya umurongo wumushoferi wibibazo bivuguruzanya. Ibishushanyo bigomba kugerageza kuringaniza byombi kugirango ubone ibisubizo byiza. Mu imurikagurisha mpuzamahanga ry’imodoka yo muri Amerika y'Amajyaruguru 2001, Volvo yo muri Suwede yashyize ahagaragara imodoka yayo iheruka SCC. Inkingi yimbere yahinduwe muburyo buboneye, yometseho ikirahure kibonerana kugirango umushoferi abashe kubona isi hanze akoresheje inkingi, kuburyo ahantu hatabona umurima wo kwerekwa yagabanutse kugeza byibuze.
