Its the tend due to the number of people being injury or kill let along accidents caused by speeders, failing to yield the right of way to pedesiden and cycles.
Lot of places in NA are moving in this direction and very common in Europe.
The other thing coming is the no turning on red lights and those signs can be found in the Portland today as well many parts of Toronto and NA. Some states are going back to the no turning on the red that were removed in the 70's due to oil shortage. Saw a lot hell with that yesterday in a number of places.