Flaggers are in high demand in today's job market. The Flagging for Traffic Control course through CWI will provide you the opportunity to train and receive the certification necessary for your current job or if you are getting started. Your certification training will prepare you to: Meet Idaho State Department of Transportation requirements. Operate in a safe manner. Direct traffic to protect the highway construction workforce. Work in short and long-term positions. The certification is for 3 years and is good in Idaho, Washington, Oregon, and Montana.