Proper headlight aim is critical. Check aim with a driver in the car and a full tank of gas. The low-beam cutoff (a) should be slightly below the center of the lens (b) to keep glare out of oncoming traffic and reduce the light reflection that occurs during rainy or snowy weather. The bend in the cutoff should be slightly to the right of the center of the lane, for the same purpose. This will illuminate the road surface in front of the car, as well as the curb area to the right.