This study is aimed at retrospectively analyzing and monitoring the rate of road traffic crashes using Cumulative Sum (CUSUM) charting technique. The data used in this study is a secondary data from the accident record office of the Federal Road Safety Commission (FRSC), Zone RS8 Command Headquarter, Offa Road, GRA, Ilorin, Kwara State, Nigeria for the period of January, 2000 to December, 2010. Retrospective analysis of the number of road crashes recorded during the years of study was carried out. Also Cumulative Sum (CUSUM) control chart schemes were designed and used to study the rate of road crashes. The result obtained from the Retrospective Analysis revealed that there are three significant segments which results to the following local means: 30.6, 34.10, 22.00, 46.00, 51.00, 35.54 and 54.90.