Bike lanes were a revelation for me when I arrived in Denmark.
So simple and obvious.
It does require patience on both sides though - for instance if you want to turn left here (or right in SA) as a cyclist you can't just turn with traffic you have to stop on the far side of the intersection, turn 90 degrees and wait for the lights to change before you head off.
Cars turning right (or left in SA) have to yield to bicycles going straight.
They work though - there are many, many, many more bikes here and almost no fatal accidents.