Lithibelo tsa Automatic Traffic Barriers (tseo hape li tsejoang e le Boom Gates) ke mokhoa oa moruo oa ho laola phihlello ea likoloi le ho tsoa libakeng tsa ho paka, lifeme tsa tlhahiso, menyako ea poraefete le maemo a mang a mangata. Li ka laoloa ke ho fumana karete; li-remoutu tsa radio kapa lisebelisoa tse ling tsa taolo ea phihlello tseo e leng karolo ea sistimi e teng ea ho laola phihlello ea moaho.
