Street Design Manual

3.2.5 C - Alley, Mixed-Use (Private) Mixed Use Alleys provide access to service entrances, loading docks and garages as well as providing a location for utilities and garbage. They vary in width from 20 to 24 feet, depending on whether they are one-way or two-way. Due to their relatively low traffic volumes and vehicle loads, Mixed-Use Alleys often can accommodate GSI practices such as permeable pavement and alternative curb systems.

Raleigh Street Design Manual – Page 28