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. Tutorials of 80 pages are provided. A powerful framework allows new simulations to be added.