The Canadian Guide to In-service Road Safety Reviews is a practical guide for conducting reviews on existing roads, based on the current experience and expertise in Canada and internationally. A companion guide to TAC's Canadian Road Safety Audit Guide, this publication provides guidelines to traffic practitioners on how to upgrade the operational and physical characteristics of existing in-service roads to be more compatible with current traffic conditions and safety knowledge. The Guide is divided into the following sections: Introduction; Safety Management Systems; Data Management; Network Screening; Engineering Analysis, Countermeasures; Evaluating Road Safety Improvements; and Getting Started. The Guide would be of greatest interest to those individuals responsible for commissioning and conducting in-service road safety studies. The Canadian Guide to In-service Road Safety Reviews is part of the Canadian Road Safety Engineering Handbook (CRaSH), a series of 10 titles and anticipated titles developed under the auspices of the Road Safety Standing Committee of the Chief Engineers' Council. Although each book is specifically designed to be self-contained, taken together they comprise a comprehensive, authoritative and highly complementary set of practical guidelines. Other books in the series provide information on subject areas such as speed management and applied human factors in road safety engineering. Disponible en français : Guide des éacute;tudes de séacute;curitéacute; des routes en service (2004)