A study by the University of Nottingham funded by the RAC Foundation reveals that having a passenger in semi-autonomous cars can enhance drivers' focus and assistance in taking over manual control, but the transition back to manual driving remains challenging. Passengers were found to provide directions, prevent drowsiness, and encourage driver awareness during automated driving, yet could also be distracting. Despite passenger support, drivers showed poor control immediately after resuming manual driving, indicating complexities in human-machine interaction. The research underscores the importance of designing systems that consider human behavior in semi-autonomous vehicles, as the handover process between human and machine poses safety concerns.