There are many versions but you can pick up a cheap reflective vest for around $10. That is the minimum you should have but there is more. You can also pick up a flashing red light for about $10. Last, get a head lamp. For about $25 or $30 you can see and be seen. For as little as $10 you have safety gear and for about $50 you will be lit up like a Christmas tree. My gear is in the photo (I wear all 3 all the time).
Please be safe on the roads. If you don't have safety gear don't run roads in the dark, go to the track. BE LOUD, BE BRIGHT, BE SAFE!