(1) The commission shall provide by ordinance for the care, supervision, control, and improvement of public highways, streets, avenues, alleys, sidewalks, public grounds, bridges, aqueducts, and viaducts within the municipality and shall cause them to be kept open, in repair, and free from nuisance.
(2) When it deems it necessary, the commission may cause any street, alley, or public highway to be opened, straightened, altered, diverted, narrowed, widened, or vacated.