Make sure to run against traffic every time you go running in the dark. This way, you will have a better view of the vehicles approaching. Remember, it is always easier and safer to keep away from traffic if you can spot it.
Equally important is always to be alert and watch out for approaching bicycles and runners that may be going your way. Even if you are treading a path that does not have so much cars, chances are there are several cyclists or runners like you who might be too tired to think about bumping into co-runners and therefore cause serious injuries to both parties. So, before making a stop or turning around, make sure the way is clear.
Equally important is knowing your surroundings. Look round from time to time is important. Especially as cyclists sems to like riding on the paths too.