A road sign is traditionally read as guidance arriving from outside — a hint about which way to go. Whether you can read it clearly is taken as how sure you feel about your direction.
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.