Does not seem to be much of a deterrent, I see more without helmets than with waiting to turn off Suk into Klang. I threw a tantrum today, crossing 3rd with the pedestrian crossing lights in my favour, and none of the bikes were stopping. I jumped up and down shouting 'stop stop' and you know what, they did! I think I caused them some amusement! (There was a falang crossing with me who had mobility issues ... sometimes, the locals really do my head in!)