Final answer:
In case of a collision or a leak of dangerous goods, the driver should prioritize their safety, report the incident to the authorities, and follow the regulations specified by the Department of Transportation.
Step-by-step explanation:
When a collision happens or a leak occurs while transporting dangerous goods, the driver should take immediate actions to mitigate the risks. The driver should first ensure their own safety by leaving the area if necessary.
Then, they should notify the appropriate authorities, such as emergency services or the Department of Transportation, to report the incident and seek professional assistance.
It is important for the driver to follow the specific guidelines and procedures outlined by the United States Department of Transportation hazardous materials regulations to handle the situation effectively.