I was trying to do star trail photography but I couldn't find something cool upclose to focus on so I turned my camera towards the road and put on bulb mode having the stars move and I was just waiting for a car to pass by on the road. and one did! If I kept the exposure going longer after the car passed by would the photo have gotten overexposed and white? I kinda which I had the stars full circle on. After the car passed by I ended the exposure.