At night you depend mostly on your lights to make you visible to other drivers. This works well most of the time, but not always. If you’re riding alone on a dark road, your headlight will be visible to a driver ahead. But if you are in traffic with other headlights behind you, a driver ahead may not be able to pick your single light out of all the lights behind. This problem is especially bad when the roads are wet, because the lights reflect off the road surface.
If you’re ahead of a group of cars at night, slow down. Other drivers are even more likely than usual to turn in front of you.
Tail light and side reflectors improve nighttime visibility to the sides and rear. But again, a single tail light can get lost against the background of other lights. It can be hard for drivers to tell how far away the light is, even if they see it. You can help by adding reflectors or reflective tape to the rear of the bike, or by wearing a jacket with reflective material on it.