Layer D is the youngest layer
The frontal lobe of the brain is not essential for driving a motor vehicle. The only time that the frontal lobe would be activated during driving would be when there is potential danger, for example a car swerving in front of you. The dorsal lateral prefrontal cortex is more essential for driving, as it is involved in judgment and decision making.
Because it helps us understand our past, which in turn allows us to understand our present.