Vacant dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — DreamForth

To dream of a vacant sign may indicate a space or emptiness in your psyche. This is possibly a call from your unconscious to find a positive way to express your energy before it explodes.

A vacant premises or car park can be a suggestion of things to come, although the emptiness may feel desolate whilst you are waiting.

Source: Dream Symbols and Analysis Author: DreamForth

Interpretation 2 — Margaret Hamilton

Literal, though the timing may be elusive
Source: Dream Dictionary Unlimited Author: Margaret Hamilton