For sidewalks one does not required specific distances, use a seam (nails in concrete do not work) on the sidewalk, minimal distance 300.00m is all that is needed. End points can be easily found.
Recently been using dedicated bike lanes or pathways, chose a section with little traffic on it, thus very little interference. Street crossing can have you stop for a traffic light, minor inconvenience.
Parked vehicles like CarToGo have messed my up too many times.