If you are on a road at night, the best thing to do would be get one of those reflective vests/coats [depending on the weather] like the road crews wear. You can also get them in dog size. To guard against any idiots driving without headlights, you can get a couple of those flashing armbands to make sure you draw attention.
PS: I have seen rigid hats that have one of those flashing yellow lights like the vehicles on the tarmac at airports use, but I don't think my ego could stand being seen wearing one!]
The above can and does sometimes work against your intentions. There are frequent events where the attention-getting lights/reflectors actual draw drivers to you, especially drivers under the influence. They are attracted to the lights and typically "you go where you look". I knew some people that lost their lives in this scenario.