REGARDLESS OF THE SIZE? I take it you don't cycle?
When is a painted bike lane not a functional bike lane then? 300mm wide? Never?
If someone paints a lane on a road and deems it suitable for cycling, but is so narrow that a bike symbol cannot fit in it THEN IT'S PROBABLY NOT SUITABLE FOR CYCLING IN ALONGSIDE 2+ TON VEHICLES TRAVELING AT 60kph. REAL ROCKET SCIENCE.
I gather you don't cycle? Or are you up for a ride in this fake bike lane in the middle of a weekday? Let me guess...... nah!
Do you work for SA's DIT?