The scenario was part of a Schneider National exercise for hazardous materials responders, but in real life, many carriers keep a current Emergency Guidebook in their trucks to comply with hazmat regulations. The Emergency Response Guidebook originally was developed by the U.S. Department of Transportation, Transport Canada and the Secretariat of Transport and Communications of Mexico for use by police, firefighters and other emergency personnel who are the first to arrive at the scene of a transportation incident involving hazardous materials/dangerous goods. The ERG helps first responders quickly identify the hazard(s) of the materials and protect themselves and the general public during the initial response phase of an incident. The 'initial response phase' is the period following the first responders' arrival at the scene, during which the presence and/or identification of hazardous materials is confirmed, protective actions and area securement are initiated, and assistance of qualified personnel is requested.