Jean asked: What’s the position of bikes on the sidewalk ridden by adults?
Whether adult or not, bicyclists are allowed on sidewalks unless there is a local ordinance to the contrary. A bicyclist on the sidewalk must yield to pedestrians and make an audible notification when passing a pedestrian.
s. 316.2065 – Bicycle Regulations
(9) A person propelling a vehicle by human power upon and along a sidewalk, or across a roadway upon and along a crosswalk, has all the rights and duties applicable to a pedestrian under the same circumstances.
(10) A person propelling a bicycle upon and along a sidewalk, or across a roadway upon and along a crosswalk, shall yield the right-of-way to any pedestrian and shall give an audible signal before overtaking and passing such pedestrian.