Helps you satisfy 49 CFR Section 172.602. Use this DOT-issued guidebook to satisfy DOT's requirement that hazardous materials shipments be accompanied by emergency response information (49 CFR Section 172.602). Numerically indexed and color-coded, the DOT ERG helps emergency responders find vital information fast. All editions of the 2004 Emergency Response Guidebook contain the same information. The ERG is published by the U.S. Department of Transportation.