Driving 55. Being passed by a car. Check the rear view to see if another car is going to pass when I hear a bang. Look left and the hood has popped up on the car passing me. They continued the pass and I slowed down and they moved back into the right lane and then over to the shoulder. It was a 20 something woman. By time I stopped and got back to her car she was out of her car and on her cell phone. I put the hood back down and re attached the two hooks that they had used to hold the hood down.(failed red neck engineering) I told her she was good to go (windshield had and area that she could still see out)and that she had handled it very well. Later I realized that if she had panicked , cranked the wheel to the right, while I was looking in the mirror, It could have ended badly for both of us.