Ma liwiro la rabara ndi zida zowongolera magalimoto zomwe zimagwiritsidwa ntchito pochepetsa kuthamanga kwagalimoto kosatha kapena kwakanthawi.
Liwiro la mphira ili lopangidwa ndi mphira wa mphira wopangidwanso ndi thermoplastic, wokhala ndi 22000Lbs (matani 10) wonyamula.Kuphatikiza apo, ma humps othamanga ndi osavuta komanso ofulumira kukhazikitsa ndikuchotsa, omwe amatha kukhazikitsidwa ndi munthu m'modzi pogwiritsa ntchito zida zosavuta.Zinthu za rabara zobwezerezedwanso komanso zopepuka kwambiri, zomwe zitha kukhala zokonda zachilengedwe.Zogulitsa zakuda ndi zachikasu, zokhala ndi zokutira zowoneka bwino, zimabweretsa chidwi pa liwiro la hump usiku.Ma speed humps a driveway ndi oyenera magalimoto akulu ndi ang'onoang'ono monga: magalimoto, SUV, njinga ya olumala kuti adutse mosavuta.