Excesses of hoses and tubes of the highway under small corners are not allowed. Radius of a bend has to at least in exceed diameter of a hose 10-multiply. Hoses have to lie at distance not less than 80 mm from a final collector. It is recommended to check a condition of hoses at least 1 time a year. At repair (after depressurization of the highway in car service) hoses have to be muffled, hit of dirt in tubes is not allowed.