If you’ve been thinking about going to Burning Man, prepare to walk a lot, bike a lot and, maybe, on occasion, hitch a ride on an art car going where its going, while you ride on or in it.
The city is rather large, particularly when seen through the eyes of a pedestrian. (Pack several pairs of very comfortable walking shoes.)
For reference and understanding its size, here are some images of the Black Rock City map overlayed on several major cities. More such images are at this website.
Oh, and if you are planning on going to Burning Man, or know someone who is, you must read my book, Surviving Burning Man: A Packing List for First-Timers, available free as a PDF, and on Amazon