This constant travel underscores Walter's sense of dislocation; he has no family, no real home, and no real country. Through travel, Walter is able to avoid permanent connections, to escape responsibilities, and to remain completely unknown and unjudged.
This perpetual wandering emphasizes Walter's sense of disconnection; he has no relatives, a true home, or a true nation. By traveling, Walter is able to shun permanent relationships, flee duties, and remain entirely unseen and unappraised.