One thing I cannot recommend enough to night riders is having some type of bright helmet or head mounted light. I believe that I was hit by a car at night because despite my bright bike mounted headlight, the lady did not notice me out of her peripheral vision before making a turn just as I was passing by.

A helmet light allows you to actively interact with the vision of motorists at night - if you think there is even a small chance they are going to make their turn into you, you can point the light directly into their field of vision and get their attention immediately. I have had motorists stop in mid-turn several times since starting to use a helmet light.

I use a Petzl Tikka II headlamp, which admittedly was designed for hiking. I found it is easily helmet mountable when I secured it using velcro cable ties.