A road roller flattens everything in its path, so tradition reads it as being steamrolled — overruled or pressed flat by someone stronger. It can also stand for smoothing the way ahead.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.