I found question 3 to be misleading as, in the lesson we are told that the cars becom blurred to the extent of almost becoming invisible not the lights.
Hello Susan, I am not sure I understand your question. When taking a long exposure with your camera on a tripod anything in your image that moves will become blurred. How blurred will depend on the speed of the moving object and the length of the exposure you are using. Things like car headlights are recorded as streaks because they are much brighter than the car or vehicle itself.
I hope this has helped, David.