It is a broad road, but not straight. It wanders over hill and dale and picks out the easiest places to go. It's smooth except in a few places where bricks have crumbled or been removed, leaving holes. Following any stretch of the yellow brick road is a hazardous journey, as there are many obstacles as well as hostile creatures such as Kalidahs roaming its lengths.
Dorothy Gale and her companions the Scarecrow, Tin Woodman, and Cowardly Lion followed this road on their first adventure. In the Munchkin Forest it was broken by two deep crevices, and nearer the Emerald City a river cuts through it. (The Wonderful Wizard of Oz).
Ojo, the Patchwork Girl, the Glass Cat, and the Woozy found the road on their journey, and were captured by Man-Eating Plants. The Shaggy Man happened along and rescued them. (The Patchwork Girl of Oz)
In the VeggieTales 2007 episode "The Wonderful Wizard of Ha's", Darby (Junior Asparagus) and his pet dog "Tutu" are told by Splenda the Sweet but non-fattening fairy (Madame Blueberry) and the Munchies (The French Peas) to follow the old Yellow McToad.
Elton John sang "Goodbye Yellow Brick Road" in 1974.