The snowplow is read as clearing the way, the patient work that makes a blocked path usable again. Dream books connect it to someone, perhaps you, pushing through what has piled up.
Has this come up in your dreams before? What was going on in your life then?
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.