Pressing the accelerator stands for drive and the decision to speed things up. Tradition reads it as how much push you give your plans — eager, reckless or held back, depending on how the foot feels in the dream.
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.