(Trent Nelson | The Salt Lake Tribune) Mayor Erin Mendenhall prepares to swap out a 25 mph speed limit sign for a new 20 mph sign, in Salt Lake City on Wednesday, July 27, 2022.(Trent Nelson | The Salt Lake Tribune) Police Chief Mike Brown speaks before the swapping out a 25 mph speed limit sign for a new 20 mph sign, in Salt Lake City on Wednesday, July 27, 2022.(Trent Nelson | The Salt Lake Tribune) Mayor Erin Mendenhall and Police Chief Mike Brown prepare to swap out a 25 mph speed limit sign for a new 20 mph sign, in Salt Lake City on Wednesday, July 27, 2022.(Trent Nelson | The Salt Lake Tribune) Mayor Erin Mendenhall and council member Dan Dugan swap out a 25 mph speed limit sign for a new 20 mph sign, in Salt Lake City on Wednesday, July 27, 2022.(Trent Nelson | The Salt Lake Tribune) Mayor Erin Mendenhall and Police Chief Mike Brown prepare to swap out a 25 mph speed limit sign for a new 20 mph sign, in Salt Lake City on Wednesday, July 27, 2022. At right is city council member Alejandro Puy.