- Run on the sidewalk, not street, whenever possible.
- Be extra careful when crossing the streets because cars that are turning might not be able to see you until it's too late.
- Keep your music, if you listen to any, fairly low, so you can hear cyclists and cars that are coming up from behind.
- Dress to be seen.
An inexpensive solution to the problem of being seen at night is one of those reflective vests - sort of like what crossing guards wear. You can pick one up for less than $20 from most outdoor stores. However, they really provide no benefit other than visibility and usually aren't a great fit if you're slim.
My favorite reflective gear is my Illuminite jacket. It is wind and water resistant, so it's a great winter running piece, and the sleeves are covered in a special material that is absolutely brilliant when it comes to reflecting headlights. Plus, it has an iPod pocket in the sleeve and a pocket in back for keys, gels or whatever other small items you want to carry. I think it was designed for cyclists, but it's great for runners, too.
Be safe out there and enjoy your runs!