How can I be visible in the dark when I'm signalling a turn? My bike and I are fairly visible at night--white light in front, red light in the back, bright yellow fenders, reflective tabs and a light on my helmet.  I use hand signals to alert motorists when I'm turning... but I don't think they can see my hands in the dark.  Is there anything different I should do when I'm signalling a turn in an unlit place?
I should imagine you should be looking for some reflective gloves. Or even some glo gloves
Check these out as an example ...
http://lifehacker.com/395978/glo-gloves-reflective-cycling-gear

Also using a good reflective jacket that has good reflective strips down the arms is useful.