What document gives the driver instructions on what to do if hazmat begins to leak?

Shippers must provide emergency response information with every hazmat shipment. This includes a 24-hour emergency contact phone number staffed by someone who can speak knowledgeably about the materials. The information must travel with the shipping papers. In an incident, the driver provides this information to first responders so they can call the shipper's emergency line for technical guidance specific to the materials involved. CHEMTREC (1-800-424-9300) is a 24-hour service that can also provide chemical emergency information when the shipper's contact is unavailable. The Emergency Response Guidebook is responders' primary reference; the shipping paper emergency info is the technical specialist phone line.