One thought on whether to have lights on your bike or just on your person/backpack/helmet etc.

A taxi driver told me that having lights on your bike are important because there they are at the same height as car tail-lights. That is the level where drivers' eyes are automatically scanning for other cars/obstacles, and you are more likely to be seen.

I know other people will have different views on this, but that made sense to me. I have a light on my backpack - but I have a few on my bike too. I think you can't have too many!