Hey Jane, those signs are not city signs and were installed either by the university or business district (and are probably technically illegal). Hopefully Edgewood will happen really soon which should mitigate this problem. It's a weird situation as until we have that Portland/Copenhagen bike network biking on the sidewalk might be safest for kids 12 and under. There really aren't a ton of them biking on Chapel and York but with all the residences and schools around Edgewood I wouldn't want them not feeling comfy on the sidewalk. What you could do if you felt so inclined would be to print and cut the attached stencil, buy a can of spray paint and go to town! Good luck!