Take to the road safely and illuminated
Visibility is very important while running. As a runner, you are very vulnerable to other road users. So protect yourself on dark days by wearing lights while training!
Triathlonworld has a wide range of lighting. To be visible to others, there is a bracelet, which is easy to put on and provides enough light to be seen on roads that are not naturally very dangerous, for example where there are street lamps. To be more visible there is the harness, which gives you a reflective back as well as a strong light on both the front and back.
On really dark paths without street lighting, a headlamp is very suitable. This gives you as a runner more than enough visibility to be able to run your lap safely.