1. Bagéan penting kanggo fungsi setir mobil, nanging uga njamin safety penting
2. Struktur dhasar yaiku pasangan pinion lan rak sing saling meshing. Nalika batang setir drive pinion kanggo muter, rak bakal nindakake gerakan linear. Kadhangkala, rak lan pinion bisa langsung nyopir crossbar, supaya setir bisa setir.
3. Motor power steering ngontrol jumlah torsi setir sing ditrapake kanggo ngrampungake fungsi setir