Source: The Great Interpretation of Dreams (Ibn Sirin)
An alley in a dream indicates worry, grief, and distress. Exiting it is relief and salvation.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
An alley indicates a woman of bad character. Walking in it indicates falling into hardship.
Source: Signs in the Science of Expressions (Ibn Shaheen)
An alley is interpreted as worry. Whoever sees himself walking in it will be afflicted with worry.