When I was learning to drive, one of the things I remember that I did not have a lot of fun with was parallel parking. It was very hard at first, but I learned to do it. I am glad that they used traffic cones as markers for the space I was to park in. I did hit them a few times, but the nice thing about using parking cones is that they do not damage the car.
I have seen parking cones used for kids bicycle courses, to save parking spaces and even to mark hazards on the road. I have even seen them used to mark areas at my kids schools for playtime.