A city may by ordinance prohibit, regulate, divert, control, and limit pedestrian or vehicular traffic upon the public streets, sidewalks, alleys, and bridges of the city. (1917, c. 136, subch. 5, s. 1; 1919, cc. 136, 237; C.S., s. 2787; 1941, c. 153, ss. 1, 2; c. 272; 1947, c. 7; 1953, c. 171; 1965, c. 945; 1971, c. 698, s. 1.)