Asphalt haver ndi magetsi oyenda pamsewu amaphatikizanso njira yolumikizira, sprocket, yoyendetsa, track atchentter, okonda onyamula, othamanga onyamula, mapepala a carler, Tsitsi la mphira. Magawo awa amagwirira ntchito limodzi kuti alolere kusunthira ndi ntchito yantchito ndikuthandizira kulemera kwa makinawo pakugwiritsa ntchito.