Final answer:
Human factors psychologists are concerned with the design of self-driving vehicles, focusing on the human-machine interface to ensure safety and usability.
Step-by-step explanation:
The psychologists who are particularly concerned with issues related to the design of self-driving vehicles are human factors psychologists. Human factors psychology, also known as ergonomics in Europe, concentrates on the optimal integration of the human-machine interface, which is critical in designing self-driving vehicles. These psychologists work to ensure that machines and systems such as self-driving vehicles are designed to match human capabilities and limitations, which includes considerations for cognition, ergonomics, safety, and usability. Their goal is to enhance both effectiveness and safety for the individual users and the public at large.