Make sure that your headlights are properly aimed. Misaimed headlights blind other drivers and reduce your ability to see the road.
If there is any doubt on whether or not your headlights should be on, turn them on. Lights not only help you see better in early twilight; they also make it easier for other drivers to see you.
Don't overdrive your headlights; you should be able to stop inside the illuminated area, otherwise you are creating a blind crash area in front of your vehicle.