Jeff asked: What is the statute and requirements whereby municipalities and cities such as St. Augustine may prohibit bicycles from being ridden on sidewalks?
Local authorities may regulate bicyclists on sidewalks, including prohibiting their use of sidewalks altogether.
s. 316.008 – Powers of Local Authorities
(1) The provisions of this chapter shall not be deemed to prevent local authorities, with respect to streets and highways under their jurisdiction and within the reasonable exercise of the police power, from:
(h) Regulating the operation of bicycles
A municipality may regulate bicycles only on sidewalks under their jurisdiction. For example, a municipality may not impose regulations on sidewalks of highways under state jurisdiction, but can do so for its city sidewalks. An example is the Bridge of Lions in St. Augustine which is part of a state highway within the city limits boundary of St. Augustine. Bicycles are permitted on the bridge even though there is a city ordinance prohibiting sidewalk cycling.
Local authorities may not require bicyclists to use the sidewalk instead of the roadway. See this post: