I cannot find it now, but I seem to recall that in Toronto,  someone had added (painted) bike lanes onto a few streets.  Some people were cautiously approving but all were concerned about the uneven widths of the car lanes afterward.

On the other hand, almost everyone is approving of the 600 stop and yield signs that were placed by private citizens in Cranston, Rhode Island.

Some anonymous guerrilla urban planner has planted nearly 600 “undocumented stop signs” in the town of Cranston, RI. A special town government committee has elected to keep all but 21 stop signs and 2 yield signs — apparently, the unknown freelancer put her or his stop signs in places that really needed them.