No person shall stop, stand or park any vehicle upon a street, other than an alley, in such a manner or under such conditions as to leave available less than ten feet of the width of the roadway for free movement of vehicular traffic, except that a driver may stop temporarily during the actual loading or unloading of passengers or when directed to by a police officer or traffic-control signal.
('65 Code, § 351.11) Penalty, see § 76.99