Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.A Road Safety Audit (RSA)is defined as "the formal safety performance examination of an existing or future road or intersection by an independent, multidisciplinary team. It qualitatively estimates and reports on potential road safety issues and identifies opportunities for improvements in safety for all road users." Road safety audits are commonly used in the United Kingdom and Australia, and are coming into wider use in the United States. They are a mandatory requirement for all trunk road Highway Improvement Schemes in the UK (including motorways). The requirements of a Road Safety Audit are contained in the Design Manual for Roads and Bridges Volume 5 Section 2 - ''HD19/03 Road Safety Audit''.