Just like brake lights, a Rider can be camouflaged by a car or SUV's headlights. Riders ride on the left or right side of a lane and this puts the headlight of the motorcycle right where a following vehicle's headlight would be. Again, this is particularly true at night, however more and more cars and trucks have daytime running lights. Most motorcycles have the headlight on at all times so the headlight camouflage effect can happen any time day or night.
The trick is, change your focus. If there is a motorcycle between you and a car, it is closer than the car.
If you force yourself to see through the camouflage you will win every time!