This research seems to show car drivers give you more space if they think you are more likely to do something unpredictable.
It claims that where a cycle helmet often results in drivers giving you less space.
So how I make a driver think I am not a safe cyclist without being unsafe.
Is this the reason why the cyclists I always saw in Cambridge without lights never seem to get knocked of their bikes, but “safe” cyclists I knew with good lights and reflective jackets etc did sometimes (not often) get knocked of their bikes?
Direct link to research and a blog post by the researcher.