Final answer:
Will's dad should have called the police immediately when he saw the car with the unconscious driver. Driving around the car and continuing the journey would be unsafe and irresponsible.
Step-by-step explanation:
The correct response for Will's dad when he saw the car with the unconscious driver would be to call the police immediately.
This would be the most appropriate action to ensure that the situation is handled by professionals who can provide the necessary assistance.
Checking the driver for visible injuries could be dangerous if the driver is unconscious, and honking the truck's horn may not be effective in getting attention or providing the necessary help.
Driving around the car and continuing the journey would be unsafe and irresponsible.