What is the first thing a driver should consult to find initial response information after a hazmat incident?

After a hazmat incident, the driver (and responders) should consult the EMERGENCY RESPONSE GUIDEBOOK (ERG) to find initial response information — looking up the material by its IDENTIFICATION NUMBER (the 4-digit UN/NA number) or its PROPER SHIPPING NAME. CDL hazmat. The ERG provides: initial isolation and protective action distances, fire/spill/leak response, health hazards, and protective equipment guidance. The driver carries emergency response information (which may include the ERG and the shipper's emergency contact). The driver should also: secure the area, keep people away, notify authorities (911 and required reporting), and provide the shipping papers to responders. The ERG gives the critical initial guidance before specialized help arrives. Knowing to consult the ERG (by ID number/shipping name) is commonly tested.