The document outlines the SIN protocol for first responders at a hazardous materials incident: S is for secure - secure the scene and establish safety cordons using the Emergency Response Guidebook; I is for identify - identify the hazardous material using the UN classification and ERG yellow pages or guide 111 if unknown; N is for notify - inform command of the hazard, request specialist assistance, and establish cordons from the ERG orange pages or guide 111 if unknown. The document also shows proper vehicle marking for transportation of hazardous materials with placards on the front, rear, and both sides.