Access Road is a universal simulator of access controls that is intended to improve design and auditing of IT security. It provides simulations of GNU/Linux (components and rights on the file system), MySQL Server (components and privileges), and a generic Role-Based-Access-Control application. It is designed for database, system, and application administrators, IT architects and developers, and auditors. Reliability and the ability to explain the results are the main objectives. A 50 page tutorial is provided, and a powerful framework allows new simulations to be added.